• Metamaterials'2018
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26 August 2018 / Start time: 15 h 0 min
15:00 - 18:00 - Sunday registration
27 August 2018 / Start time: 7 h 30 min
07:30 - 08:45 - Monday registration
08:45 - 09:00 - Opening ceremony
09:00 - 10:00 - Plenary session I
09:00 - Plenary session I

Session chairperson(s): Sergei Tretyakov

09:00 - 10:00 - Complex Mechanical Metamaterials Plenary [Show abstract]
  • Martin van Hecke, Leiden University & Amolf, Netherlands
Mechanical metamaterials exploit motion, deformations, stresses and mechanical energy. Originally, the field focused on achieving unusual (zero or negative) values for familiar mechanical parameters, such as density, Poisson’s ratio or compressibility. More recently, complex metamaterials that leverage the strong nonlinearities intrinsic in mechanics have emerged. Here I discuss current and future strategies to implement spatial and temporal complexity into mechanical metamaterials.
10:00 - 10:30 - Coffee break (Monday morning)
10:30 - 12:30 - Oral sessions (Monday morning)
10:30 - Time-varying metamaterials

Session chairperson(s): Christophe Caloz; Sajjad Taravati

10:30 - 11:00 - Time-Variable and Nonlinear Metasurfaces: From Nanosecond Pulse Shaping to Photon Acceleration Invited oral [Show abstract]
  • Gennady Shvets, Cornell University, USA
Injection and generation of free carriers in high-Q metasurfaces can be used to tune its response, as well as manipulate the frequency of the photons trapped inside the photonic structure. The effect is particularly dramatic in the mid-infrared part of the spectrum because of the scaling of the refractive index correction with the wavelength. In this talk I will describe two platforms for using free carriers to manipulate optical pulses. One approach can be classified as passive: free carriers are injected into graphene on a nanosecond time scale, resulting in reshaping the amplitude, phase, and polarization state of a nanosecond laser pulse interacting with a graphene-integrated plasmonic metasurface. The second, active non-perturbative approach, can be understood as photon acceleration, i.e. the extreme modification of the spectrum of a femtosecond laser pulse interacting with a semiconductor metasurface whose resonant frequency is rapidly evolving due to the generation of electrons and holes. Applications of photon acceleration to tunable harmonics generation, non-reciprocal light propagation will be described. We will demonstrate that photon acceleration is the mechanism for enhancing nonlinear interactions without sacrificing the bandwidth.
11:00 - 11:30 - Time-Modulated Structures for Energy Accumulation Invited oral [Show abstract]
  • Sergei Tretyakov, Aalto University, Finland
  • Mohammad Sajjad Mirmoosa, Aalto University, Finland
  • Grigorii Ptitsyn, Aalto University, Finland
  • Viktar Asadchy, Aalto University, Aalto University
Accumulation of electromagnetic field energy in lossless objects (resonators, metasurfaces, reactive circuit elements) is limited by the amplitude of time-harmonic external sources. In the steady-state regime, all incident power is fully re-radiated (reflected), and the stored energy does not increase in time, although the external source continuously supplies energy. Here, we show that lossless objects can continuously accumulate unlimited energy if their properties are made time-varying. Here we consider the simplest example of a reactive load of a transmission line and analytically derive the required time dependence of the load reactance for unlimited energy accumulation. We also prove that properly designing time-varying resonant circuits, one can arbitrarily engineer the time dependence of the current in the circuit fed by a given time-harmonic source. Finally, we discuss how this stored energy can be released in form of a time-compressed pulse.
Media link(s):

See arxiv preprint M.S. Mirmoosa, G.A. Ptitcyn, V.S. Asadchy, S.A. Tretyakov, Unlimited accumulation of electromagnetic energy using time-varying reactive elements, Preprint (https://arxiv.org/abs/1802.07719).

11:30 - 11:45 - Recent Advances in Theory, Concepts, and Applications of Space-Time Modulated Media Oral [Show abstract]
  • Sajjad Taravati, Concordia University, Canada
  • Ahmed A. Kishk, Concordia University, Canada
We report on our latest results concerning the theory, concepts, and applications of space-time modulated media. This includes a collection of theoretical, numerical and experimental demonstration of new classes of space-time varying structures and their unique functionalities.
11:45 - 12:00 - Space-time-varying Field-Processing Metasurfaces Oral [Show abstract]
  • Nima Chamanara, Polytechnique de Montreal, Canada
  • Yousef Vahabzadeh, Polytechnique de Montreal, Canada
  • Christophe Caloz, Polytechnique de Montreal, Canada
This paper leverages space-time variation to design metasurfaces that perform precise spatio-temporal transformations on incident electromagnetic pulses. We demonstrate how to synthesize and model space-time varying metasurfaces capable of performing transformations such as time reversal, pulse shaping, perfect pulse refraction, and mathematical derivation.
12:00 - 12:00 - Non-Reciprocal Wave Propagation in Dynamic Materials: Homogenization, Scattering and Adiabatic Regimes Withdrawn [Show abstract]
  • Guoliang Huang, University of Missouri, USA
  • Hussein Nassar, University of Missouri, USA
Salient features of non-reciprocal wave propagation in dynamic materials, i.e., materials whose properties depend on time at a rate comparable to the frequency of waves propagating within, are examined in three distinct regimes. In the homogenization regime, the dynamic material is shown to exhibit a stress-velocity coupling characteristic of Willis materials. This coupling leads to a left-right bias in propagation speeds whereby waves going left/right travel faster than similar waves traveling in the opposite direction. In the scattering regime, Bragg theory is adopted and modified to account for frequency-shifting effects. Accordingly, Bragg reflection will only occur in specific directions thus leading to the emergence of one-way bandgaps. Last, in the adiabatic regime, one-way bandgaps are characterized through a topological invariant, a Chern number, proven to be quantized and accordingly robust. A connection between one-way bandgaps and the existence of one-way edge states is established in the context of a bulkedge correspondence principal.
12:00 - 12:15 - Open Discussion Oral [Show abstract]
  • Chairs, Speakers, Audience
<p> Open discussion</p>
12:15 - 12:30 - Advanced Wave Manipulation of Space-Time Modulated Media Under Oblique Incidence Oral [Show abstract]
  • Sajjad Taravati, Concordia University, Canada
  • Ahmed A. Kishk, Concordia University, Canada
We present a theoretical and numerical framework for the wave spectrum manipulation and control of electromagnetic waves using time-periodic space-time modulated slabs. We show that such slabs provide peculiar and unique control over electromagnetic fields as well as wave spectrum alteration. Interesting features include new frequency generation, unidirectional wave manipulation, and space-scanning.
10:30 - Acoustic metasurfaces

Session chairperson(s): Ana Diaz-Rubio; Steven Cummer

10:30 - 11:00 - Wavefield Shaping for Complex Acoustic Sound Invited oral [Show abstract]
  • Guancong Ma, Hong Kong Baptist University, Hong Kong
Wavefront shaping with spatial light modulators is a recent breakthrough in light propagation in diffusive medium. Here, for the first time, we apply this concept to acoustic waves. To do so, we have designed and built the first binary-phased spatial sound modulator (SSM), which is essentially a reconfigurable acoustic metasurface. The metasurface consists of unit cells with two states controllable through programmed electronics. We demonstrate the novel capability of controlling and re-shaping complex sound field with proof-of-principle experiments in complex reverberating environments.
11:00 - 11:30 - Acoustic Metasurfaces Invited oral [Show abstract]
  • Steven Cummer, Duke University, USA
  • Yangbo Xie, Duke University, USA
  • Chen Shen, Duke University, USA
  • Junfei Li, Duke University, USA
  • Zhetao Jia, Duke University, USA
Acoustic metasurfaces enable the manipulation of sound waves with structures of subwavelength thickness We will describe our research in this area over the past several years, and also describe a new approach for the design and implementation of metasurfaces for perfect wavefront transformation.
11:30 - 11:45 - Bianisotropic Acoustic Metasurface for Highly Efficient Wavefront Transformation Oral [Show abstract]
  • Junfei Li, Duke University, USA
  • Chen Shen, Duke University, United States
  • Ana Díaz-Rubio, Aalto University, Finland
  • Sergei Tretyakov, Aalto University, Finland
  • Steven Cummer, Duke University, USA
A fundamental limit for GSL-based metasurfaces is their power efficiency, especially at large deflection angles. Here we designed and fabricated the bi-anisotropic cells for wavefront transformation acoustic metasurface that overcomes this limit, allowing us to steer the power flow without parasitic scattering. Our discretized design is verified numerically and experimentally.
11:45 - 12:00 - High-efficient Acoustic Anomalous Reflector Based on Power-flow Conformal Metamirror Oral [Show abstract]
  • Ana Diaz-Rubio, Aalto University , Finland
  • Junfei Li, Duke University, USA
  • Chen Shen, Duke University, USA
  • Steven A. Cummer, Duke University, USA
  • Sergei A. Tretyakov, Aalto University, Finland
In the last years, metasurfaces have attracted much attention due to the capability of tailoring the response in a sub-wavelength scale and their compact implementations. In the particular case of reflective metasurfaces, also called metamirrors, anomalous reflection is a fundamental transformation between two plane waves propagating in different directions. The analysis of this scenario is important for evaluating the potential use of engineered surfaces for more complex functionalities, such as lenses or holograms. Despite the apparent simplicity of this problem, current designs suffer from low efficiency or high complexity. In this paper, we present the analysis and design of an acoustic anomalous reflector device based on power-flow conformal metamirrors. The proposal is experimentally verified showing good agreement with the theoretical predictions.
12:00 - 12:15 - Vortex-Sound Diffusers using Spiral Metasurfaces Oral [Show abstract]
  • Noé Jiménez, Universitat Politècnica de València, Spain
  • Vicent Romero-García, Université du Mans, France
  • Jean-Philippe Groby, Université du Mans, France
Metamaterials allow the accurate control of the acoustic scattering using subwavelength thickness panels. In this work, we report the scattering of spiral-shaped metasurfaces with practical application to sound diffusers. We analytically, numerically and experimentally show that bipolar spiral-shaped metasurfaces produce broadband non-specular reflection. We observe that the reflected energy can be scattered at higher diffraction orders and, due to the spiral geometry, the phase of the scattering field rotates producing a vortex in the near field. Thus, the specular component at normal incidence vanish. This produces a perfect correlation-scattering coefficient when comparing to a rigid flat reflector of same dimensions. In particular, the scattering of an Archimedes spiral metasurface is presented. We show that the scattering pattern corresponds to a high-order Bessel beam. The use of binary locally reacting surfaces with chiral geometry produce non-specular reflected patterns, allowing the use of these structures use as sound diffusers.
12:15 - 12:30 - Broadband Diffusion of Acoustic Waves Via A 1-bit Coding Metasurface Oral [Show abstract]
  • Wenkang Cao, Southeast University, China
  • Liting Wu, Southeast University, China
  • Gangyong Song, Southeast University, China
  • Qiang Cheng, Southeast University, China
The acoustic diffusers play key roles in noise control and ultrasound imaging. Here, we propose a new approach to design broadband acoustic diffusers with 1-bit acoustic coding metasurfaces, which are composed of two basic unit cells with out-of-phase responses. We show that the 1-bit acoustic coding metasurfaces are able to diffuse the acoustic waves at will by optimizing the coding sequences, giving rise to ultralow backscattering as desired.
10:30 - Plasmonics I

Session chairperson(s): Evgenii Narimanov; Katja Höflich

10:30 - 10:45 - Hyperbolic Modes of a Single Metal-Dielectric Interface Oral [Show abstract]
  • Evgenii Narimanov, Purdue University, USA
Subwavelength light confinements at surface plasmon resonance is fundamentally limited by the inherent mobility of free electrons. We report that this non-locality of the electromagnetic response of free charge carriers also results in the formation of a hyperbolic layer near the metal-dielectric interface. While the resulting "hyperbolic blockade" leads to the suppression of the conventional plasmon resonance, the hyperbolic layer also supports an entirely new class of surface waves, that offer longer propagation distance and stronger field confinement. Furthermore, these "hyper-plasmons" are not limited to the proximity of the plasmon resonance, which extends the operational bandwidth of plasmonic devices.
10:45 - 11:00 - Light Scattering by Disordered Assemblies of Plasmonic Nanonantennas Oral [Show abstract]
  • Eslam El Shamy, ONERA, France
  • Patrick Bouchon, ONERA , France
  • Julien Jaeck, ONERA, France
  • Riad Haïdar, ONERA and Ecole Polytechnique, France
Optical nanoantennas are widely used to build absorbing metasurfaces with applications in photodetection, solar cells and biology. Most of the time, the nanoantennas are assembled as a periodic distribution, but there have been various works where disordered arrays are used, either to get rid of diffraction orders or due to a fabrication process that prevents any determined distribution. Here, we investigate both theoretically and experimentally, the unavoidable scattering introduced by such disorder and we show how this scattering can be manipulated from 0 to 50% of the incoming light.
11:00 - 11:15 - Strong Coupling and Non-reciprocity in the Dynamics of a V-Atom Placed Near an Anisotropic Metasurface Oral [Show abstract]
  • Danil Kornovan, ITMO University, Russia
  • Mihail Petrov, ITMO University and Aalto University, Russia and Finland
  • Ivan Iorsh, ITMO University, Russia
In this work, we focus on studying the temporal dynamics of a V-type quantum emitter with two excited states, which allows to observe an interplay between different spontaneous emission channels. We show that the presence of an anisotropic metasurface enables an interaction between the two active transitions and makes it possible to achieve a strong coupling regime. We also show that if the rotation plane of the transition dipole moments is arbitrarily oriented with respect to the metasurface interface, it is possible to observe a non-reciprocal behavior.
11:15 - 11:30 - The Resonant Behavior of a Single Plasmonic Helix Oral [Show abstract]
  • Katja Höflich, Helmholtz-Zentrum Berlin für Materialien und Energie, Germany
  • Enno Hansjürgen, Carl von Ossietzky University Oldenburg, Germany
  • Thorsten Feichtner, University of Würzburg, Germany
  • Caspar Haverkamp, Helmholtz-Zentrum Berlin für Materialien und Energie, Germany
  • Heiko Kollmann, Carl von Ossietzky University Oldenburg, Germany
  • Christoph Lienau, Carl von Ossietzky University Oldenburg, Germany
  • Martin Silies, Carl von Ossietzky University Oldenburg, Germany
Single silver helices with strongly resonant features in the visible range are investigated. They show a strong circular dichroism with resonant features in good agreement with full field modeling. The mechanism of excitation is elucidated using a simple geometric model and analytical considerations.
11:30 - 12:00 - “Plasmonics” in Free Space and the Far-Field Metamaterial Superlens Invited oral [Show abstract]
  • Nikolay Zheludev, University of Southampton and NTU Singapore, UK and Singapore
  • Guanghui Yuan, NTU Singapore, Singapore
  • Edward Rogers, University of Southampton, UK
We report experimental realisation of a radically new type of metamaterial “super-lens” capable of creating superoscillatory foci of arbitrary shape and size. Using integrated metamaterial interferometry that allows mapping of fields with resolution ~λ/100 we reveal the analogy between plasmonic nano-focusing of evanescent waves and superoscillatory nano-focusing of free-space waves.
12:00 - 12:00 - Plasmonic Enhancement and Manipulation of Optical Nonlinearity in Monolayer WS2 Withdrawn [Show abstract]
  • Jinwei Shi, Beijing Normal University, China
Two-dimensional transition metal dichalcogenides have giant second order nonlinearity. However, the sub-nanometer thickness of monolayer limits the conversion efficiency. Here, we experimentally show that the second-harmonic generation of WS2 can be enhanced by integrating it on a plasmonic metasurface. The direct enhancement factor of 400 can be realized due to the strong field confinement of the plasmonic dark mode. Meanwhile, the polarization dependence of SHG can also be controlled by the plasmonic mode.
12:00 - 12:15 - Bose-Einstein Condensation in a Plasmonic Lattice Oral [Show abstract]
  • Tommi Hakala, Aalto University, Finland
  • Antti Moilanen, Aalto University, Finland
  • Aaro Väkeväinen, Aalto University, Finland
  • Rui Guo, Aalto University, Finland
  • Jani-Petri Martikainen, Aalto University, Finland
  • Konstantinos Daskalakis, Aalto University, Finland
  • Heikki Rekola, Aalto University, Finland
  • Aleksi Julku, Aalto University, Finland
  • Päivi Törmä, Aalto University, Finland
We demonstrate a Bose-Einstein condensate (BEC) of surface plasmon polaritons in a lattice of metallic nanoparticles. Interaction of the surface plasmon modes with organic dye molecules induces thermalization by subsequent absorption and re-emission processes. With suitable lattice periodicity this interaction enables ultimately condensation in picosecond timescales. The dynamics are studied in an experiment that utilizes the propagation of the modes and the “open cavity character” of the system. Linewidth narrowing and increase of the spatial coherence of the mode is observed in response to onset of condensation. Transition from BEC to usual lasing is observed when the periodicity of the lattice is varied. This new form of condensate has also technological potential due to its ultrafast, room-temperature and on-chip nature.
12:15 - 12:30 - Fiber-Tip Coupling of Bloch Surface Waves Oral [Show abstract]
  • Michele Scaravilli, University of Sannio, Italy
  • Alberto Micco, University of Sannio, Italy
  • Giuseppe Castaldi, University of Sannio, Italy
  • Giuseppe Coppola, CNR-IMM, Italy
  • Mariano Gioffrè, CNR-IMM, Italy
  • Mario Iodice, CNR-IMM, Italy
  • Vera La Ferrara, ENEA, Italy
  • Vincenzo Galdi, University of Sannio, Italy
  • Andrea Cusano, University of Sannio, Italy
<p> We experimentally demonstrate the excitation of Bloch surface waves on the tip of single-mode optical fibers via a grating-coupled mechanism. In spite of unavoidable fabrication-related tolerances, we evaluate sensing performances in line with state-of-the-art plasmonic benchmarks, paving the way for the development of advanced ‘all-dielectric’ lab-on-fiber optrodes.</p>
10:30 - Theory and modeling I

Session chairperson(s): Fabrice Pardo; Christian Kern

10:30 - 10:45 - Light-Based Analog Computing Using a Single Array of Polarizable Particles Oral [Show abstract]
  • Younes Ra'di, The University of Texas at Austin, United States
  • Andrea Alù, The University of Texas at Austin, United States
Light-based signal processing in the spatial domain enables parallel computation, resulting in faster operations in comparison to digital-based systems. We propose a basic platform to realize spatial differentiation and integration of the impinging wavefront using a basic array of electric/magnetic dipoles. We also leverage bianisotropic inclusions to realize odd operations on the impinging wavefront. Our results show that a single array of polarizable particles enables sufficient degrees of freedom to realize optical analog computing using metasurfaces.
10:45 - 11:00 - Electromagnetic Field on the Space-Time Map Oral [Show abstract]
  • Marina Yakovleva, Université Paris-Sud, Université Paris-Saclay, France
  • Jean-Luc Pelouard, Université Paris-Sud, Université Paris-Saclay, France
  • Fabrice Pardo, Université Paris-Sud, Université Paris-Saclay, France
Differential forms in their application to electromagnetism are unique visualization tools and elegant way to describe electromagnetic fields. On examples of graphical representations of space-time maps of electric and magnetic fluxes, we will show they contain all the information about electromagnetic fields.
11:00 - 11:15 - Mode Hopping in 1D Arrays of Resonant PEC Thin Wires Over an Interface Between Two Dielectric Media Oral [Show abstract]
  • Victor Zalipaev, ITMO University of St.Petersburg, Russia
  • Sergey Kosulnikov, ITMO University of St.Petersburg, Russia
  • Stas Glybovski, ITMO University of St.Petersburg, Russia
  • Alena Schelokova, ITMO University of St.Petersburg, Russia
  • Alexey Slobozhanyuk, ITMO University of St.Petersburg, Russia
  • Pavel Belov, ITMO University of St.Petersburg, Russia
Guided localized electromagnetic waves propagating along 1D arrays of thin metallic parallel wires, finite and infinite, are studied. The array of thin PEC wires is embedded in the upper dielectric half-space close to the interface separating two dielectric media with different permittivities. In the first part of the work we study dependence of resonance frequencies of localized modes excited by a finite array of parallel thin wires illuminated by normally incident plane electromagnetic wave with respect to the array height over the interface. Due to the symmetry only two main modes are excited. It is important that when the height of the array becomes sufficiently small the order of the resonance modes changes. We apply numerical analysis based on the Pocklington system of integral equations to compute resonance frequencies and construct excited localized modes above the array. We also compare our results against computations obtained by means of another independent numerical model.
11:15 - 11:30 - Spin-wave Localization with Quasi-periodic Magnonic Metamaterials Oral [Show abstract]
  • Kazuzyuki Nakayama, Fukuoka University, Japan
  • Satoshi Tomita, Nara Institute of Science and Technology, Japan
  • Ren Kawasaki, Nara Institute of Science and Technology, Japan
  • Kenji Kasahara, Fukuoka University, Japan
  • Nobuyoshi Hosoito, Nara Institute of Science and Technology, Japan
  • Hisao Yanagi, Nara Institute of Science and Technology, Japan
  • Takashi Manago, Fukuoka University, Japan
We study the emergence of localized mode in magnonic metamaterials with quasi-periodic structure. The magnonic metamaterials consist of jointed quasi-periodic grating made of metallic ferromagnetic material. A micromagnetic simulation was demonstrated that localized spin-wave advents at the vicinity of jointed interface.
11:30 - 11:45 - TE-wave Propagation in a Graded Waveguide Structure Oral [Show abstract]
  • Mariana Dalarsson, Linnaeus University, Sweden
  • Sven Nordebo, Linnaeus University, Sweden
We investigate TE-wave propagation in a hollow waveguide with a graded dielectric barrier. We obtain exact analytical results for the electric field components, as well as the exact analytical results for the reflection and transmission coefficients valid for waveguides of arbitrary cross sectional shapes.
11:45 - 12:00 - Embedding Fields Into Invisible Metasurface-Bound Volumes Oral [Show abstract]
  • Francisco Cuesta, Aalto University, Finland
  • Viktar Asadchy, Aalto University, Finland
  • Mohammad Sajjad Mirmoosa, Aalto University, Finland
  • Xin Ma, Northwestern Polytechnical University, Aalto University, China, Finland
  • Sergei Tretyakov, Aalto University, Finland
<p> Embedded eigenstates are exotic optical modes which are decoupled from radiating waves, and whose quality factor and lifetime can be unlimited. Here we consider these states as a limit of a more general scenario where one can control the fields inside metasurface-bound cavities which do not produce any scattering fields. We show that for a specific illumination direction it is possible to engineer the fields inside (for example, make them very large or very small) while the system remains perfectly invisible. This study is relevant to such applications as low-observable sensors, electromagnetic cloaking, and non-linear devices.</p>
Media link(s):

A more detailed analysis is shown in our arxiv preprint.

12:00 - 12:30 - Hall Effect Metamaterials Invited oral [Show abstract]
  • Christian Kern, Karlsruher Institut für Technologie, Germany
  • Muamer Kadic, Institut FEMTO-ST, Karlsruher Institut für Technologie, France, Germany
  • Martin Wegener, Karlsruher Institut für Technologie, Germany
  • Graeme Milton, University of Utah, USA
We review the emerging field of Hall effect metamaterials and present a coherent homogenization theory for deriving the effective parameters. Furthermore, we present two new structures showing a sign reversal of the effective Hall coefficient, which are conceptually distinct from the previously introduced chainmail-inspired metamaterials.
12:30 - 14:00 - Lunch break (Monday)
14:00 - 15:30 - Oral sessions (Monday - afternoon 1)
14:00 - Exotic effects and properties I

Session chairperson(s): Mario Silveirinha; Humeyra Caglayan

14:00 - 14:15 - 20 New Varieties: Unexplored Constitutive Relations And Axions Oral [Show abstract]
  • Jonathan Gratus, Lancaster University and the Cockcroft Institute, UK
  • Paul Kinsler, Lancaster University and the Cockcroft Institute, UK
  • Martin McCall, Imperial College London, UK
We eliminate the excitation fields (D,H) by combining the corresponding Maxwell's equations with the constitutive relations. For a homogeneous, non-dispersive, local medium, this gives rise to 20 new parameters. Four are axionic and 16 relate differentials of (E,B) to the charge and current in non-standard ways.
14:15 - 14:30 - Real Sources in Complex Spaces Oral [Show abstract]
  • Hayrettin Odabasi, Eskisehir Osmangazi University, Turkey
  • Fernando Teixeira, The Ohio State University, USA
We utilize complex transformation optics (CTO) to mimic complex source point (CSP) fields. It is shown that the CSP fields can be exactly reproduced via planar metamaterial slabs associated with the proper complex coordinate transformations. CTO extends the real-valued coordinate transformations to complex-valued coordinate transformations. Of conventional TO, one can also control the amplitude of the fields in addition to their phase paths. In the present paper, we demonstrate that CSP fields can be produced through appropriate material tensors prescribed by the corresponding complex coordinate transformations.
14:30 - 14:45 - Enhancement of Circular Dichroism in Epsilon-Near-Zero Chiral Hyperbolic Media Oral [Show abstract]
  • Igor Nefedov, Aalto University, Finland
  • Egor Gurvitz, ITMO University, Russia
  • Alexander Shalin, ITMO University, Russia
  • Pavel Ginzburg, Tel Aviv University, Israel
We are presenting a theoretical study of light transmission through a slab of hyperbolic metamaterial made of gold rods, with chiral inclusions, thus possessing both hyperbolic and chiral properties. We have shown that circular dichroism can be strongly enhanced in epsilon-near-zero regime, when the diagonal component of the permittivity tensor corresponding to the normal to interface coordinate tends to zero. The necessary condition of the enhancement is a non-zero light incidence angle. This effect results from a considerable wavelength shortening in normal direction that increases the interaction between light and matter.
14:45 - 15:00 - Lateral Optical Forces On Linearly-Polarized Emitters Near A Reciprocal Substrate Oral [Show abstract]
  • Hafssaa Latioui, University of Lisbon, Portugal
  • Mario Silveirinha, University of Lisbon, Portugal
We investigate optical forces on dipole-type emitters near a reciprocal translation-invariant substrate. Surprisingly, we find that for linearly-polarized electric dipoles the lateral force vanishes, independent of the substrate anisotropy or chirality. We identify a novel opportunity to have recoil forces with a superposition of two collinear electric and magnetic dipoles.
15:00 - 15:15 - Moving Beyond the Point-Like Scatterer - The Dramatic Effects of Subwavelength Coupling on Micro-Doppler Signatures Oral [Show abstract]
  • Dmitry Filonov, Tel Aviv University, Israel
  • Vitali Kozlov, Tel Aviv University, Israel
  • Pavel Ginzburg, Tel Aviv University, Israel
Micro-Doppler signatures carry information on the internal motion of an electromagnetic scatterer. While standard approaches, developed for radar analysis of targets, consider rotary motion in a phenomenological fashion, detailed electromagnetic analysis enables to extract much more information regarding a motion of an object. In this report, we present a novel analysis method that allows the extraction and analysis of micro-Doppler signatures from strongly coupled subwavelength objects. This technique can allow new types of signal processing that extend the current capabilities of standard micro-Doppler methods, which were designed for large and weakly coupled objects. Such standard methods often require expensive high-frequency equipment in order to properly extract the signal, which restricts their applicability in daily use applications. Our method enables relaxing those constraints. As an example of the usefulness of the new technique, we analyze the case of a double-rotor helicopter illuminated by a low-frequency continuous wave and show how its signature can be used to estimate the angle between the rotors. New types of experiments, supported with comprehensive electromagnetic analysis will be presented.
15:15 - 15:30 - Cancelling Magnetic Sources at a Distance with Negative Permeability Oral [Show abstract]
  • Rosa Mach-Batlle, Universitat Autonoma de Barcelona, Spain
  • Carles Navau, Universitat Autonoma de Barcelona, Spain
  • Alvaro Sanchez, Universitat Autonoma de Barcelona, Spain
The control of magnetic fields, traditionally done by using magnetic materials, has recently been enriched with the development of magnetic metamaterials. However, all magnetic materials and metamaterials have positive permeability values. Here we show how the consideration of negative permeability in magnetostatics yields a new set of possibilities for controlling static magnetic fields. They include intriguing possibilities such as the cancellation at a distance of the field created by a magnet.
14:00 - Acoustic metamaterials I

Session chairperson(s): Guancong Ma; Maaz Farooqui

14:00 - 14:15 - Coherent Perfect Absorption with Bubble Metascreens Oral [Show abstract]
  • Maxime Lanoy, University of Manitoba, Canada
  • Reine-Marie Guillermic, University of Manitoba, Canada
  • Anatoliy Strybulevych, University of Manitoba, Canada
  • John H. Page, University of Manitoba, Canada
The particularly efficient and low frequency Minnaert resonances of air bubbles in fluids or soft solids make them excellent candidates for the realization of acoustic metamaterials. Here, we study the transmission of a plane wave through a single meta-layer consisting of periodic arrangement of air bubbles trapped in a viscoelastic matrix and show how a perfect coherent absorber can be realized.
14:15 - 14:30 - Interferometric Control of Absorption in a 3-port Acoustic Network Oral [Show abstract]
  • Olivier Richoux, University of Le Mans, France
  • Vassos Achilleos, University of Le Mans, France
  • Georgios Theocharis, University of Le Mans, France
  • Ioannis Brouzos, University of Athens, Greece
An acoustic 3-port network is studied both theoretically and experimentally and CPA is found using asymmetric and symmetric inputs. We further study the sensitivity of CPA and propose optimized structures presenting CPA and CPT at the same frequency by tuning only phase and/or amplitude change of the input.
14:30 - 14:30 - Measurement of Monopole and Dipole Scattering in Acoustic Meta-Atoms Withdrawn [Show abstract]
  • Joshua Jordaan, Australian National University, Australia
  • David Powell, University of New South Wales, Australia
A technique is presented to experimentally determine the monopole and dipole scattering coefficients in two-dimensional acoustic meta-atoms. The technique is calibrated against the known solution for scattering from a hard cylinder. It is then applied to space-coiling type structures, which support resonances of different multipolar order. It is shown that good quality results can be achieved for geometries having wider channels and thicker walls. Performance with narrower channels and thinner walls is poorer, which we attribute to thermo-viscous effects or excitation of elastic vibrations within the structure.
14:30 - 14:45 - High-order Modes Of Spoof Surface Acoustic Waves Oral [Show abstract]
  • Liting Wu, State Key Laboratory of Millimeter Waves, Southeast University, China
  • Wenkang Cao, State Key Laboratory of Millimeter Waves, Southeast University, China
  • Gangyong Song, State Key Laboratory of Millimeter Waves, Southeast University, China
  • Qiang Cheng, State Key Laboratory of Millimeter Waves, Southeast University, China
  • Tiejun Cui, State Key Laboratory of Millimeter Waves, Southeast University, China
<p> Spoof surface acoustic waves (SSAWs), achieved by the perfect rigid body (PRB) textured with subwavelength structures, can support strongly localized surface waves. Here, we explore the high-order modes of SSAWs in the corrugated structures with large height, whose impact on the dispersion relations are intensively discussed. The high-order modal fields are analyzed for better understanding of the underlying physics in SSAW generation.</p>
14:45 - 15:00 - Manipulating Acoustic Waves Radiation Direction Using Liner Surface Modes Oral [Show abstract]
  • Maaz Farooqui, Laboratoire d’Acoustique de l’Universite du Maine, France
  • Yves Auregan, Laboratoire d’Acoustique de l’Universite du Maine, France
  • Vincent Pagneux, Laboratoire d’Acoustique de l’Universite du Maine, France
Acoustic liners are treatments of wall with impedance boundary condition, and they can be used to generate Acoustic Surface Waves (ASWs). In this work, we show how to design the impedance treatment in order to avoid the reflection of acoustic waves at the open end of a duct (anechoic termination). Moreover, by changing the liner geometry at the end of the duct, it is possible to control the acoustic wave radiation pattern. This work can have interesting applications for directional acoustic propagation.
15:00 - 15:15 - Demonstration of Steering Acoustic Waves by Generalized Eaton Lens Oral [Show abstract]
  • Dongwoo Lee, Pohang University of Science and Technology, South Korea
  • Choonlae Cho, Seoul National University, South Korea
  • Namkyoo Park, Seoul National University, South Korea
  • Junsuk Rho, Pohang University of Science and Technology, South Korea
We demonstrate the generalized Eaton lens in the acoustic regime by using the S-parameter retrieval method to obtain effective properties. The proposed design composed of cylindrical PMMA rods corresponding the required effective indices can steer acoustic waves at arbitrary refraction angles up to 45˚ in a broad range of frequency.
15:15 - 15:30 - Radiation Characteristics of Acoustic Luneburg Lens Consisted of FCOC Metamaterial Oral [Show abstract]
  • Choon Mahn Park, Dong-A University, South Korea
  • Sang Hun Lee, Seonam University, South Korea
Two-dimensional acoustic Luneburg lens that can easily be expanded into a three-dimensional sphere is fabricated. We investigated typical characteristics of the resulting acoustic Luneburg lens, such as its aberration-free performance and capability for antipodal focusing of the lens for the incident plane waves through experiments and simulations.
14:00 - Plasmonics II

Session chairperson(s): Dimitrios Tzarouchis; Alexei Vinogradov

14:00 - 14:30 - Highly Confined Surface Plasmon on Nanostructured Surface of Aluminum Invited oral [Show abstract]
  • Alexei Vinogradov, Dukhov Research Institute of Automatics, Russia
  • Eugeni Chubchev, Dukhov Research Institute of Automatics, Russia
  • Igor Nechepurenko, Dukhov Research Institute of Automatics, Russia
  • Alexander Dorofeenko, Dukhov Research Institute of Automatics, Russia
  • Alexander Lisyansky, City University of New York, USA
We demonstrate that in the ultraviolet range, surface plasmon propagating along a periodically nanostructured aluminum surface have a exhibits the confinement length as small as 10 nm. At the same time, the propagation length of new surface plasmon-polaritons can reach dozens of its wavelengths.
14:30 - 14:45 - Plasmon-excitonic Enhancement of the Transverse Magneto-Optical Kerr effect in the Semiconductor Magnetic Nanostructures Oral [Show abstract]
  • Olga Borovkova, RQC, Russia
  • Felix Spitzer, TU Dortmund University, Germany
  • Andrey Kalish, RQC, Russia
  • Vladimir Belotelov, RQC, Russia
  • Ilya Akimov, TU Dortmund University, Germany
  • Aleksander Poddubny, Ioffe Institute, Russia
  • Victor Sapega, Ioffe Institute, Russia
  • Maciej Wiater, Institute of Physics, Poland
  • Tomasz Wojtowicz, Institute of Physics, Poland
  • Grzegorz Karczewski, Institute of Physics, Poland
  • Anatoly Zvezdin, RQC, Russia
  • Dmitry Yakovlev, TU Dortmund University, Germany
  • Leonid Litvin, Raith GmbH, Germany
  • Ralf Jede, Raith GmbH, Germany
  • Manfred Bayer, TU Dortmund University, Germany
It is reported an enhancement of the transverse magneto-optical Kerr effect (TMOKE) in the vicinity of the excitonic and hybrid plasmon-exciton modes. Such modes are excited in quantum well in the bare diluted semiconductor thin films and in the plasmonic semiconductor nanostructures. Two-order enhancement of the TMOKE is observed in bare semiconductor films in the spectral region of the excitonic resonances. In plasmonic semiconductor nanostructures with quantum wells we also observe the hybridization of the TMOKE spectrum due to excitation of plasmon-exciton modes.
14:45 - 15:00 - Surface Plasmon Resonances in the Diffracted Magneto-Optical Effects Oral [Show abstract]
  • Rafael Cichelero, Institut de Ciencia de Materials de Barcelona, Spain
  • Mikko Kataja, Institut de Ciencia de Materials de Barcelona, Spain
  • Gervasi Herranz, Institut de Ciencia de Materials de Barcelona, Spain
We study how magnetic manipulation of surface plasmon polaritons (SPPs) can influence the diffraction properties of metallic diffraction gratings. Experimental measurements unveil non-reciprocal diffraction pattern due to the ability of transverse magnetic fields to modify the SPP excitation condition.
15:00 - 15:15 - Plasmonic Eigenmodes on Regular Nano-Polyhedra: Case Study of Electrostatic and Dynamic Resonant Effects on Rounded Superquadric Solids Oral [Show abstract]
  • Dimitrios Tzarouchis, Aalto University and University of Pennsylvania, Finland and USA
  • Pasi Ylä-Oijala, Aalto University, Finland
  • Ari Sihvola, Aalto University, Finland
The use of the theory of characteristic modes for the study of plasmonic eigenstates of rounded hexahedral and octahedral nanoscatterers is proposed and presented. After a brief study of electrostatic modes in an hexahedral structure follows the corresponding characteristic mode analysis. The analysis reveals the existence, for the first time, of highly symmetric dark modes on the surface of a rounded cube, enhancing our views on the triggered scattering mechanisms for single nanoparticles.
15:15 - 15:30 - A Galvanically Replaced Composite Nanocrystal Based Metamaterials for Plasmonic Applications Oral [Show abstract]
  • Soo-Jung Kim, Korea University, South Korea
  • Mingi Seong, Korea University, South Korea
  • Heon Lee, Korea University, South Korea
  • SoongJu Oh, Korea University, South Korea
  • Sung-Hoon Hong, ETRI, South Korea
We demonstrate the simple fabrication way of the tunable, thermally and chemically stable plasmonic metamaterials using nanoimprinting and galvanic replacement process. By galvanic replacement process, the Ag-Pt (or Ag-Au, Ag-Pd) composite metamaterials were fabricated and the optical plasmonic resonances were controlled for various applications.
14:00 - Active/non-Hermitian systems I

Session chairperson(s): Flynn Castles; Silvio Hrabar

14:00 - 14:15 - Active Metamaterials with Negative Static Dielectric Susceptibility Oral [Show abstract]
  • Flynn Castles, Queen Mary University of London, United Kingdom
  • Patrick Grant, University of Oxford, United Kingdom
We argue that, contrary to well-established theory and experiment for passive materials, active materials may exhibit negative static dielectric susceptibility: the electric analogue of diamagnetism. We fabricate and experimentally verify active structures with tunable and negative effective dielectric susceptibility for static electric fields.
14:15 - 14:30 - Analysis of Metamaterial-inspired N-type Non-Foster Oscillator Oral [Show abstract]
  • Silvio Hrabar, University of Zagreb, Croatia
  • Leo Vincelj, University of Zagreb, Croatia
  • Igor Krois, University of Zagreb, Croatia
Recently introduced non-Foster antenna-transmitter could be viewed as an extension of familiar concept of one-port negative-resistance oscillator. Here, we report preliminary numerical and experimental results of applying this formalism to the design of N-type non-Foster oscillator that may be used in future active self-oscillating metasurfaces.
14:30 - 15:00 - Non-linearity Enhances Versatility of Non-Foster Metamaterials and Metasurfaces Invited oral [Show abstract]
  • Silvio Hrabar, University of Zagreb, Croatia
Classical applications of non-Foster elements presume their linearity. Here, we show that the voltage-conversion and the current-conversion negative impedance converters show different behavior in non-liner regime. It is followed by different power-dependent properties of generated reactance/susceptance. This effect may be used in self-oscillating and self-mixing metasurfaces and in power-tunable metamaterials/metasurfaces.
15:00 - 15:30 - Constant Pressure Sound Waves in Non-Hermitian Disordered Metamaterials Invited oral [Show abstract]
  • Etienne Rivet, Swiss Federal Institute of Technology, Switzerland
  • Andre Brandstötter, Vienna University of Technology, Austria
  • Konstantinos G. Makris, University of Crete, Greece
  • Hervé Lissek, Swiss Federal Institute of Technology in Lausanne, Switzerland
  • Stefan Rotter, Vienna University of Technology, Austria
  • Romain Fleury, Swiss Federal Institute of Technology in Lausanne, Switzerland
In theory, waves with constant amplitude can be perfectly transmitted through a disordered medium by adding a properly designed distribution of gain and loss. We present the theory and the first experimental proof of this concept in a one-dimensional acoustic metamaterial.
15:30 - 16:00 - Coffee break (Monday afternoon)
16:00 - 18:00 - Oral sessions (Monday - afternoon 2)
16:00 - Applications of microwave and THz metamaterials

Session chairperson(s): Geoffroy Lerosey; Michal Cifra

16:00 - 16:15 - Reduction of the Beam-Coupling Impedance in Accelerating Structures Using Metamaterial-Based Absorbers Oral [Show abstract]
  • Maria Rosaria Masullo, Istituto Nazionale di Fisica Nucleare, Naples unit, Italy
  • Vittorio Giorgio Vaccaro, Istituto Nazionale di Fisica Nucleare, Naples unit, Italy
  • Roberto Losito, European Organization of Nuclear Research (CERN), Switzerland
  • Alessandro Masi, European Organization of Nuclear Research (CERN), Switzerland
  • Nassim Chikhi, University of Naples “Federico II”, Italy
  • Can Koral, University of Naples “Federico II”, Italy
  • Gian Paolo Papari, University of Naples “Federico II”, Italy
  • Anna Pugliese, University of Naples “Federico II”, Italy
  • Antonello Andreone, University of Naples “Federico II”, Italy
Resistive-wall impedance constitutes a significant percentage of the total beam-coupling impedance budget of an accelerator. Under extreme conditions, like large power handling and ultra-high vacuum, metamaterial-based absorbers can represent a valid alternative to other approaches for impedance mitigation in specific accelerator components, like resonant (parasitic) cavities or collimators operating along the beam line. We design sub-wavelength 2D metallic resonant structures based on split rings or on 3D hyperbolic tapered waveguide arrays that can be employed as mode dampers in accelerating structures. A number of prototypes are fabricated and then measured in a “test model” pillbox cavity.
16:15 - 16:30 - Microwave Bandgap Structure for Detecting Changes in Dynamics of Water Molecules Oral [Show abstract]
  • Michal Cifra, Institute of Photonics and Electronics, Czechia
  • Daniel Havelka, Institute of Photonics and Electronics, Czechia
  • Ondrej Krivosudský, Institute of Photonics and Electronics, Czechia
  • Jiří Průša, Institute of Photonics and Electronics, Czechia
We designed a sensing defected bandgap microwave structure based on periodically modulated coplanar waveguide with a sharp resonance at around 40 GHz due to defect in periodicity. In simulation, we demonstrated that the resonance peak is sensitive to changes of water relaxation time which can occur due to biomolecule presence.
16:30 - 17:00 - Wavefront Shaping in the Microwave Domain Using Tunable Metasurfaces: Concept and Applications Invited oral [Show abstract]
  • Geoffroy Lerosey, Greenerwave and Institut Langevin, France
  • Philipp Del Hougne, Institut Langevin, France
  • Fabrice Lemoult, Institut Langevin, France
  • Mathias Fink, Institut Langevin, France
In this talk we will show that the concept of wavefront shaping, originally proposed in optics, can be transposed to the lower frequency domain of microwaves, using electronically controllable metasurfaces. We will provide a physical background of wavefront shaping of microwaves in reverberant media and provide several examples of applications, from enhanced and greener wireless communications to smart cavities.
17:00 - 17:15 - Highly Efficient Multichannel Reflection With Metagratings Oral [Show abstract]
  • Vladislav Popov, Universite Paris-Saclay, France
  • Fabrice Boust, Universite Paris-Saclay and ONERA, France
  • Shah Nawaz Burokur, Univ Paris Nanterre, France
In this study, metagratings are used to gain total control over waves diffracted in the far-field. A 1D periodic array of N polarization electric line currents per super cell placed on a grounded dielectric substrate and excited by an incident plane wave is considered. To validate the developed theoretical approach wide-banded anomalous and multichannel reflections are demonstrated with 3D full-wave simulations at 10 GHz.
17:15 - 17:30 - Could Wi-Fi Waves Bouncing Around Inside an Indoor Room Perform Analog Computation? Oral [Show abstract]
  • Philipp del Hougne, Institut Langevin, France
  • Geoffroy Lerosey, Greenerwave, PC'Up, France
We introduce the idea that – subject to appropriate wavefront shaping – any disordered medium can serve as analog computation unit acting on impinging waves. We demonstrate the ease of implementation with an experiment emulating Wi-Fi waves in indoor environments. Using home-made tunable metasurfaces to shape the wave field, we perform a 4x4 complex-valued operation.
17:30 - 18:00 - Power Vortices in Wire-Medium Endoscopes Invited oral [Show abstract]
  • Constantin Simovski, Aalto University, Finland
  • Dmitro Vovchuk, University of Chernivtsi, Ukraine
  • Sergei Kosulnikov, University ITMO, St. Petersburg, Russia
In this paper we show that for a multiwire endoscope the concept of bending losses is not relevant. An array of metal wires makes the frequency-averaged power transmittance of the endoscope robust to the bends, however, the frequency dispersion of the power loss factor is strongly oscillating. These oscillations are related to power vortexes in the endoscope which drastically increase the radiation loss. This issue is critical for the future of wire-medium endoscopes.
16:00 - Elastic metamaterials

Session chairperson(s): Corentin Coulais; Jensen Li

16:00 - 16:30 - Engineering Elastic Wave Propagation Using Metasurface Approach Invited oral [Show abstract]
  • Jensen Li, Hong Kong University of Science and Technology, Hong Kong
  • Yongquan Liu, University of Birmingham, United Kingdom
We introduce our recent approaches to manipulate elastic waves based on metasurfaces. By using both non-resonating and resonating structures, flexible amplitude or phase of transmission and reflection can be obtained. Symmetry breaking and Fabry-Pérot resonance on the structures are further applied to obtain asymmetric reflection of elastic waves.
16:30 - 17:00 - An Elastic Metasurface with Real-Time Programmed Wave Control Extended oral [Show abstract]
  • Guoliang Huang, University of Missouri, USA
  • Yangyang Chen, University of Missouri, USA
Here, we introduce a programmable elastic metasurface for the first time with self-sensing-and-actuating units, allowing to adapt and reprogram its wave control functionalities in real time.
17:00 - 17:15 - Experimental Observation of Elastic Edge Waves in Mechanical Granular Graphene Oral [Show abstract]
  • Li-Yang Zheng, Laboratoire d'Acoustique de l'Université du Mans, France
We theoretical and experimental study the wave dynamics in a two-dimensional magneto-granular graphene. The measured dispersion curves and evidence of Dirac cone are presented. In addition, the experimental observation of edge wave propagation in the granular graphene is demonstrated.
17:15 - 17:30 - Negative Reflection and Refraction of Guided Elastic Waves Oral [Show abstract]
  • François Legrand, Institut Langevin, France
  • Benoit Gérardin, Institut Langevin, France
  • Jérôme Laurent, Institut Langevin, France
  • Claire Prada, Institut Langevin, France
  • Alexandre Aubry, Institut Langevin, France
We report on the experimental implementation of negative refraction phenomena with guided elastic waves. On the one hand, we explore the analogy between negative reflection and phase conjugation for the control of waves in random scattering and chaotic media. On the other hand, we implement the concept of complementary media and the ability to cancel the propagation of waves by adjoining two mirror regions of opposite refractive indices. To that aim, a semi-analytical model and FDTD numerical simulations have been developed to optimize and design these acoustic devices. Wave propagation through the designed elastic plates is experimentally investigated by means of laser interferometry.
17:30 - 17:45 - Asymmetric Elastic Wave Propagation in Spatiotemporal Granular Phononic Crystal Oral [Show abstract]
  • Florian Allein, Le Mans Université, France
  • Samuel P. Wallen, The University of Texas at Austin, USA
  • Georgios Theocharis, Le Mans Université, France
  • Nicholas Boechler, University of California, USA
We present a granular-based acoustic device to control elastic wave propagation that takes advantage of the translational and rotational degrees of freedom in the device. Asymmetric wave propagation is investigated via spatiotemporal modulation of stiffnesses. The presence of directional band gaps, directional wave conversion, and directional wave reflection/transmission is shown.
17:45 - 18:00 - Inertial Amplification Induced Phononic Band Gaps in a Chiral Elastic Metamaterial Oral [Show abstract]
  • Cetin Yilmaz, Bogazici University, Turkey
A helical structure with periodic disks is investigated. By varying the helix angle of the links that connect the disks, dispersion diagram of this chiral structure is altered. Both Bragg scattering and inertial amplification induced gaps are generated. Compact analytical formulations are derived for the band gap starting frequency and the notch frequency due to inertial coupling within the structure.
16:00 - Quantum effects

Session chairperson(s): Iñigo Liberal; Xiangdong Zhang

16:00 - 16:30 - Quantum Metamaterials with Extreme Nonlinearities Invited oral [Show abstract]
  • Zhaowei Liu, University of California, San Diego, USA
With the size of metal films entering into the nanoscale, the impact of quantum size effect becomes significantly important. Here we demonstrate a giant optical Kerr susceptibility in sub-3nm gold films, which is 4 order-of-magnitude higher than the intrinsic value of bulk gold, opening new doors for metamaterials with extreme nonlinearities.
16:30 - 17:00 - Controlling Photon Statistics with Arrays of Quantum Emitters Extended oral [Show abstract]
  • Iñigo Liberal, Public University of Navarre, Spain
  • Iñigo Ederra, Public University of Navarre, Spain
  • Richard W. Ziolkowski, University of Arizona, US
We introduce the concept of quantum antenna arrays, i.e., ensembles of quantum emitters that enable control over photon statistics of any order by designing the geometry of the array. To this end, we generalize conventional antenna array theory by introducing an array factor of order L, which describes the impact of the array geometry in angular photon statistics of order L. As an example, we examine the emission properties of a linear vertical array, and we discuss its application as a source of directionally entangled photon bunches.
17:00 - 17:15 - Metamaterial Chips: Implementing Quantum Algorithm Oral [Show abstract]
  • Xiangdong Zhang, Beijing Institute of Technology, China
  • Weixuan Zhang, Beijing Institute of Technology, China
  • Kaiyang Cheng, Tongji University, China
  • Chao Wu, Tongji University, China
  • Yi Wang, Tongji University, China
  • Hongqiang Li, Tongji University, China
We report recent researches on a new class of metamaterial chips to perform wave-based quantum algorithms. The metamaterial chips have been fabricated by using 3D printing technique. Quantum searching algorithm and Deutsch–Jozsa algorithm have been demonstrated experimentally by using our metamaterial chips. Such metamaterial-based quantum algorithm simulators may lead to remarkable achievements in wave-based signal processors.
17:15 - 17:30 - 2D Semi-Analytical Model for Optimizing the Radiation Emission of Quantum Emitters Embedded in a Bounded Nano-Patterned Hyperbolic Metamaterial Oral [Show abstract]
  • Achiles Fontana da Mota, University of São Paulo, Brazil
  • Augusto Martins, University of São Paulo, Brazil
  • Vinicius Marrara Pepino, University of São Paulo, Brazil
  • Emiliano Rezende Martins, University of São Paulo, Brazil
  • John Weiner, University of São Paulo, Brazil
  • Fernando Lisboa Teixeira, Ohio State University, USA
  • Ben-Hur Viana Borges, University of São Paulo, Brazil
We propose a two dimensional (2D) semi-analytical method to calculate the radiated power and Purcell factor of a quantum emitter (QE) embedded in a medium bounded between a nano-patterned structure and a homogeneous dielectric. We apply our 2D model to optimize a nano-patterned hyperbolic metamaterial (HMM) to increase the QE’s quantum efficiency while preserving a high Purcell factor. The low computational cost of this method makes it quite attractive for quantum efficiency optimization, providing initial physical and/or geometrical parameters to be fine-tuned with three-dimension (3D) full-wave techniques such as FDTD.
17:30 - 17:45 - Optical Properties of Core-Shell Systems with Sub-Nanometer Plasmonic Gaps: A Quantum Hydrodynamic Theory Approach Oral [Show abstract]
  • Muhammad Khalid, Istituto Italiano di Tecnologia, Italy
  • Fabio Della Sala, Institute for Microelectronics and Microsystems-CNR, Italy
  • Cristian Ciraci, Istituto Italiano di Tecnologia, Italy
Plasmonic response of the metallic structure characterized by sub-nanometer dielectric gaps can be strongly effected by nonlocal or quantum effects. In this paper, we investigate these effects in spherical nanomatryoshka structures with sub-nanometer core-shell separation. We use the state-of-the-art quantum hydrodynamic theory to study both near-field and far-field optical properties of these systems. We find that the results obtained using the QHT method are in a very good agreement with those of time-dependent density functional theory.
17:45 - 18:00 - Coherent Perfect Absorption and Switching in a Fiberized Quantum Network with Plasmonic Metadevice Oral [Show abstract]
  • Anton Vetlugin, Nanyang Technological University, Singapore
  • Ruixiang Guo, Nanyang Technological University, Singapore
  • Angelos Xomalis, University of Southampton, United Kingdom
  • Salih Yanikgonul, Data Storage Institute, A*STAR, Singapore
  • Giorgio Adamo, Nanyang Technological University, Singapore
  • Cesare Soci, Nanyang Technological University, Singapore
  • Nikolay Zheludev, University of Southampton, United Kingdom
In this report we provide the first demonstration of a fully fiberized quantum network with a fiber-integrated metamaterial as a dissipative switching element. Using the phenomenon of coherent absorption in plasmonic metamaterials we achieve high-contrast control of the single photon absorption probability and demonstrate switching application.
16:00 - Sensing and imaging

Session chairperson(s): GIUSEPPE STRANGI; Alexander V. Kildishev

16:00 - 16:15 - Coherent Electron Transport in Metamaterials of Integrated Semiconductor Quantum Dots and Biomolecules for Medical Imaging Applications Oral [Show abstract]
  • Bakhysh Bairamov, Ioffe Institute, St. Petersburg, Russia
  • Vadimir Toporov, Ioffe Institute, St. Petersburg , Russia
  • Farid Bayramov, St.Petersburg National Research Academic University RAS, Russia
  • Oleg Chakchir, St.Petersburg National Research Academic University RAS, Russia
  • Harry Lipsanen, Aalto University, Finland
  • Ilkka Tittonen, Aalto University, Finland
  • Mack Kira, University of Michigan, USA
The fundamental research of many-body interactions and coherent transport of single particle elementary excitations exploiting strong-light matter interactions in artificial molecular metamaterials of nc-Si/SiO2 quantum dots as well as their functionalization by biomolecules will be considered.
16:15 - 16:30 - Terahertz and Infrared Imaging of Absorption in Disordered Metasurfaces Oral [Show abstract]
  • Nicolas Fernez, Université de Lille, France
  • Ludovic Burgnies, Université du Littoral Côte d'Opale, France
  • Guillaume Ducournau, Université de Lille, France
  • Eric Lheurette, Université de Lille, France
We performed terahertz imaging of absorption parameter in positional disordered metasurfaces as a function of frequency. This experimental characterization highlights the influence of array density in absorption level and bandwidth. In addition infrared imaging of these metasurfaces under large signal excitation is used to analyze the role of extended modes in the absorption mechanism.
16:30 - 17:00 - High Temperature Sensing with Refractory Plasmonic Metasurfaces Invited oral [Show abstract]
  • Urcan Guler, Purdue University, USA
  • Krishnakali Chaudhuri, Purdue University, USA
  • Shaimaa Azzam, Purdue University, USA
  • Harsha Reddy, Purdue University, USA
  • Vladimir Shalaev, Purdue University, USA
  • Alexandra Boltasseva, Purdue University, USA
  • Alexander Kildishev, Purdue University, USA
We utilize refractory plasmonic material titanium nitride to experimentally demonstrate metasurface-based remote optical sensing of high temperatures in harsh environmental conditions. Temperature-dependent optical constants give rise to a change in reflectance with varying temperatures.
17:00 - 17:30 - Extreme Optics of Hyperbolic Dispersion: Plasmons at the Bio-Photonic Interface Invited oral [Show abstract]
  • Giuseppe Strangi, Case Western Reserve Univeristy and UNICAL , USA
  • Sreekanth K.V., Case Western Reserve Univeristy and NTU Singapore, USA
  • Mohamed ElKabbash, Case Western Reserve Univeristy, USA
  • Michael Hinczewski, Case Western Reserve Univeristy, USA
<p> In recent years significant efforts have been made to design and fabricate functional nanomaterials for biomedical applications. These research activities unlocked a complete new research field known as nano-biophotonics. Extreme optics of artificial materials characterized by hyperbolic dispersion allowed to access new physical effects and mechanisms. The unbound isofrequency surface of hyperbolic metamaterials opened the way for virtual infinite photonic density of states and ultrahigh confinement of electromagnetic fields in multilayered nanostructures which led to perfect absorption and unparalleled sensing properties. Optical sensor technology based on plasmonic metamaterials offers significant opportunities in the field of clinical diagnostics, particularly for the detection of lower-molecular-weight (&lt;500 Da) biomolecules in highly diluted solutions. Research activities based on new advanced designs of hyperbolic dispersion metamaterials for perfect absorption and super-collimation will be discussed.</p>
17:30 - 17:45 - Detection of Small Magnetic Fields via Magneto-optical Intensity Effect in Metal-dielectric Heterostructures Oral [Show abstract]
  • Andrey Kalish, Russian Quantum Center, Russia
  • Grigory Knyazev, Russian Quantum Center, Russia
  • Pavel Kapralov, Russian Quantum Center, Russia
  • Nikolay Gusev, Russian Quantum Center, Russia
  • Petr Vetoshko, Russian Quantum Center, Russia
  • Anatoly Zvezdin, Russian Quantum Center, Russia
  • Vladimir Belotelov, Russian Quantum Center, Russia
A new method for detection of weak magnetic fields using the longitudinal magnetophotonic intensity effect in periodic metal-dielectric heterostructures is proposed. Experimental demonstration of the method allowed to achieve sensitivity of about 1 nT in the spectral band of 60 kHz. A theoretical estimate of the sensitivity limit is given.
17:45 - 18:00 - Measuring Glucose Content in Aqueous Solutions by means of Split Ring Resonator (SRR) Loaded Transmission Lines Oral [Show abstract]
  • Paris Velez, Universitat Autonoma de Barcelona, Spain
  • Jonathan Muñoz, Universitat Autonoma de Barcelona, Spain
  • Javier Mata-Contreras, Universidad de Málaga, Spain
  • David Dubuc, Laboratory of Analysis and Architecture of Systems, France
  • Katia Grenier, Laboratory of Analysis and Architecture of Systems, France
  • Ferran Martín, Universitat Autonoma de Barcelona, Spain
In this paper, a pair of uncoupled microstrip lines each one loaded with a split ring resonator (SRR) in a symmetric configuration is useful to measure the solute content in very diluted solutions. The principle of operation of this microwave sensor is symmetry disruption, achieved by loading both resonators with different aqueous solutions.
18:00 - 20:00 - Espoo City Reception
28 August 2018 / Start time: 9 h 0 min
09:00 - 10:00 - Plenary session II
09:00 - Plenary session II

Session chairperson(s): Vincenzo Galdi

09:00 - 10:00 - Metasurface Antenna Design Plenary [Show abstract]
  • Stefano Maci, University of Siena , Italy
A review of recent achievements obtained in Metasurface Antennas design is presented. These antennas are based on a transformation between a cylindrical surface-wave (SW) and a leaky-wave (LW) through interaction with a periodically modulated MTS. The latter is realized by using sub-wavelength patches of different dimensions printed on a grounded slab or by metal pins on stepped metallic ground. A general design process is described, followed by a description of the main challenges and open problems in practical implementation.
10:00 - 10:30 - Coffee break (Tuesday morning)
10:30 - 12:30 - Oral sessions (Tuesday morning)
10:30 - Special session: Recent advances and trends in metasurfaces I

Organizer(s): David Smith; Stefano Maci

Session chairperson(s): David Smith; Stefano Maci

10:30 - 11:00 - Electrically Tunable Metasurfaces Invited oral [Show abstract]
  • Ali Forouzmand, Northeastern University, USA
  • Mohammad Mahdi Salary, Northeastern University, USA
  • Hossein Mosallaei, Northeastern University, USA
Several novel methodologies and design principles are proposed to realize tunable multifunctional and multispectral metasurfaces which operate based on gate-tunable biasing and integration of indium-tin-oxide into plasmonic and all-dielectric nanostructures offering large phase modulation. Moreover, the potential of time-modulation for achieving wide operating bandwidth and full phase-agility is investigated.
11:00 - 11:30 - Line Waves and Unidirectional Propagation on Metasurfaces Invited oral [Show abstract]
  • Daniel Sievenpiper, University of California San Diego, USA
  • Dia'aaldin Bisharat, University of California San Diego, USA
We have developed a new kind of waveguide in which the modes consist of the interface states between two complementary impedance surfaces. It is analogous to two-dimensional surface waves, which are bound to the planar interface between two media, but in this case the waves are bound to the one-dimensional line interface between two sheets. They have several important properties, including a field singularity, and unidirectional propagation of two orthogonal modes, such that the polarization is locked to the propagation direction. We will examine how they are realized using metasurfaces, and their relationship to other media such as photonic topological insulators and chiral materials.
11:30 - 12:00 - Engineering Diffraction With Analytically Designed Metagratings Invited oral [Show abstract]
  • Oshri Rabinovich, Technion - Israel Institue of Technology, Israel
  • Ariel Epstein, Technion - Israel Institue of Technology, Israel
We report analytical methodologies for synthesis of planar devices for perfect beam deflection, based on periodic arrays of printed capacitors (meta-atoms). These so called metagratings (MGs) were shown to facilitate efficient anomalous reflection by tuning the capacitor width and position such that the spurious (specular) reflection is cancelled, and all of the incoming power is coupled to the desirable (first-order) Floquet-Bloch mode. In this talk we present two advancements with respect to previous work. First, we incorporate a supporting substrate into the analytical model, allowing rigorous design of realistic printed-circuit-board (PCB) MGs for perfect anomalous \emph{reflection}. Second, we extend the MG concept to include multiple meta-atoms per period, enabling control of multiple diffraction modes, implementing perfect anomalous \emph{refraction}. Importantly, both physical designs, verified via full-wave simulations, are obtained without any optimization in commercial solvers, demonstrating the efficiency and reliability of the proposed schemes for developing advanced diffraction engineering surfaces.
12:00 - 12:30 - From Cascaded Metasurfaces to Compound Metaoptics Invited oral [Show abstract]
  • Anthony Grbic, University of Michigan, USA
  • Zhanni Wu, University of Michigan, USA
  • Brian O. Raeker, University of Michigan, USA
  • Amin Ranjbar, University of Michigan, USA
This paper summarizes recent advances and ongoing work by the authors in the area of metamaterial surfaces. Specifically, cascaded metasurfaces are described that consist of multiple subwavelength patterned sheets and can exhibit electric, magnetic, and magnetoelectric properties.
10:30 - Tunable/programmable metamaterials

Session chairperson(s): Anastasiia Krushynska; xiang wan

10:30 - 10:45 - Tunable Extraordinary Sound Transmission by a Metasurface Based on Acoustic Mie-Resonator Dimers Oral [Show abstract]
  • Jin Zhang, Nanjing University, China
  • Ying Cheng, Nanjing University, China
  • Desheng Ding, Southeast University, China
  • Xiaojun Liu, Nanjing University, China
The effective impedance modulation of artificial acoustic metamaterials is crucial in application scenarios. Here, a Mie-resonator dimer is proposed as a tunable mutual inductive coupled unit to drive a mismatched to matched impedance transition, which can achieve a wide impedance modulation range.
10:45 - 11:00 - Tunable Extremely Wide Low-frequency Band Gaps in Accordion-like Metamaterials Oral [Show abstract]
  • Anastasiia O. Krushynska, University of Trento, Italy
  • Ada Amendola, University of Salerno, Italy
  • Federico Bosia, University of Turin, Italy
  • Chiara Daraio, California Institute of Technology, U.S.A.
  • Nicola M. Pugno, Department of Civil, Environmental and Mechanical Engineering, Italy
  • Fernando Fraternali, Department of Civil Engineering and University of Salerno, Italy
To achieve wave control at broad-band ultra-low frequencies, we design “accordion-like” meta-structures by periodically alternating tensegrity prisms with solid disks. The structures are characterized by extremely wide band gaps, which can be tuned by varying the level of prestress in the constituent elements. They provide valid alternatives to other metamaterials with low-frequency performance, the functionality of which relies on a locally resonant mechanism, by overcoming an inherent limit of narrow operating frequency ranges and demonstrating the resilience to variations in geometric and material parameters.
11:00 - 11:15 - Tunable Perfect Anomalous Reflection in Metasurfaces with Capacitive Lumped Elements Oral [Show abstract]
  • Odysseas Tsilipakos, Foundation for Research and Technology Hellas, Greece
  • Fu Liu, Aalto University, Finland
  • Alexandros Pitilakis, Foundation for Research and Technology Hellas, Greece
  • Anna Tasolamprou, Foundation for Research and Technology Hellas, Greece
  • Do-Hoon Kwon, University of Massachusetts Amherst, USA
  • Mohammad Mirmoosa, Aalto University, Finland
  • Nikolaos Kantartzis, Foundation for Research and Technology Hellas, Greece
  • Eleftherios Economou, Foundation for Research and Technology Hellas, Greece
  • Maria Kafesaki, Foundation for Research and Technology Hellas, Greece
  • Costas Soukoulis, Foundation for Research and Technology Hellas & Ames Laboratory and Iowa State University, Greece & USA
  • Sergei Tretyakov, Aalto University, Finland
We demonstrate tunable perfect anomalous reflection with metasurfaces incorporating lumped elements. Properly tuning the capacitance of each element allows for tilting the reflected wavefront. The performance is thoroughly assessed for both TE and TM polarization and for reflection to the first and second diffraction order.
11:15 - 11:30 - Electrically Tunable Solid-State Terahertz Metamaterial Absorbers Oral [Show abstract]
  • Dimitrios Zografopoulos, Istituto per la Microelettronica e Microsistemi, Italy
  • Goran Isic, University of Belgrade, Serbia
  • Borislav Vasic, University of Belgrade, Serbia
  • Antonio Ferraro, Istituto per la Microelettronica e Microsistemi, Italy
  • Giorgos Sinatkas, Aristotle University of Thessaloniki, Greece
  • Emmanouil Kriezis, Aristotle University of Thessaloniki, Greece
  • Radoš Gajić, University of Belgrade, Serbia
  • Romeo Beccherelli, Istituto per la Microelettronica e Microsistemi, Italy
Electrically tunable terahertz metamaterial absorbers are designed, based on critically coupled resonant cavities filled with n-doped GaAs. By reverse biasing a Schottky junction at the top GaAs/metal interface, the GaAs complex permittivity is tuned, achieving amplitude modulation of the reflected wave with low insertion losses and theoretically infinite extinction ratio.
11:30 - 11:45 - Dynamic Steganographic Crypto-metaprints Oral [Show abstract]
  • Jaehyuck Jang, Pohang University of Science and Technology, South Korea
  • Heonyeong Jeong, Pohang University of Science and Technology, South Korea
  • Junsuk Rho, Pohang University of Science and Technology, South Korea
Meta-structural colours demand a broad and dynamic/tunable colours for the next step toward real life applications. We used Kerker’s conditions to design broad and dynamic meta-structural colours with near-zero-loss dielectric material. The colours are modulated by changing unit nanocuboid structures and incident polarization state; this process enables highly-secure steganographic crypto-metaprints.
Media link(s):

A demonstration video can be watched at below link.

https://www.dropbox.com/s/76kqqyxdpxrpxrt/Supplementary%20movie%203.wmv?dl=0

11:45 - 12:00 - Direct Transmission Of Near-field Images Using Binary Programmable Metasurface Oral [Show abstract]
  • Xiang Wan, Southeast University, China
  • Tie Jun Cui, Southeast University, China
A binary programmable metasurface is designed to generate arbitrary images in the near-field region. By adequately changing the coding sequences of the metasurface, these images can be detected by a single fixed probe, hence realizing direct transmission of near-field images.
12:00 - 12:30 - Emerging Materials for Tailorable Nanophotonic Devices Invited oral [Show abstract]
  • Zhuoxian Wang, Purdue University, USA
  • Deesha Shah, Purdue University, USA
  • Krishnakali Chaudhuri, Purdue University, USA
  • Alessandra Catellani, Instituto Nanoscienze, Italy
  • Mohamed Alhabeb, Drexel University, USA
  • Harsha Reddy, Purdue University, USA
  • Xiangang Meng, Purdue University, USA
  • Shaimaa Azzam, Purdue University, USA
  • Nathaniel Kinsey, Virginia Commonwealth University , USA
  • Alexander Kildishev , Purdue University, USA
  • Young Kim , Purdue University, USA
  • Vladimir Shalaev, Purdue University, USA
  • Arrigo Calzolari, Instituto Nanoscienze , USA
  • Yury Gogotsi , Purdue University, USA
  • Alexandra Boltasseva, Purdue University, USA
We report on two classes of emerging materials, ultra-thin TiN and MXenes, as a potential material platform for plasmonic metamaterials. Due to their increased sensitivity to structural and compositional parameters, both ultra-thin TiN and MXenese are promising candidates for tailorable nanophotonic devices.
10:30 - Novel effects enabled by optical metamaterials

Session chairperson(s): Alessio Monti; Kyoungsik Kim

10:30 - 11:00 - Resonant Scattering of Ultrashort Laser Pulses: New Effects Invited oral [Show abstract]
  • Michael Tribelsky, Lomonosov Moscow State University, Russia
A survey of the recent results of the author in the unsteady high-Q resonant scattering of ultrashort laser pulses by nanoparticles is presented. It is shown that the unsteadiness of the scattering process may result in qualitative changes of the phenomenon both in the near field and in far field wave zones. The most attention is paid to the dynamics of the nonradiating anapole modes and dynamical Fano resonances, which are discussed in detail. Simple, analytically tractable models are proposed to describe the transient processes. Their comparison with the results of the direct numerical integration of the complete set of the Maxwell equations shows that the models exhibit high accuracy in the quantitative description of the phenomenon.
11:00 - 11:30 - Elasto-Optic Metamaterials For Large-Scale Optical Devices Invited oral [Show abstract]
  • Kyoungsik Kim, Yonsei University, South Korea
  • Dongheok Shin, Yonsei University, South Korea
  • Changwook Kim, Yonsei University, South Korea
By mechanically compressing the transparent nanoporous silica aerogels, we realize gradient index optical components and devices which have inhomogeneous refractive index distribution in the visible wavelength region. A Luneburg lens and a transformation optics wave bender are experimentally demonstrated.
11:30 - 11:45 - Spontaneous Emission from Embedded Quantum Dots Enhanced by Mie Resonances Oral [Show abstract]
  • Mihail Petrov, ITMO University, Russia
Resonant silicon nanostructures possessing magnetic and electric Mie resonances became of strong interest for nanophotonics. Previously, the light emission stimulated with Mie modes was considered from the quantum sources placed outside the resonators such as colloid quantum dots. In this work we, for the first time, demonstrate that the emission enhancement from Ge(Si) quantum dots embedded inside the nanoresonators. We observe reshaping of the emission spectrum and demonstrate that it can be controlled through the mode engineering in silicon nanoresonators oligomer structures.
11:45 - 12:00 - Tailoring Optical Reflections Through Lattices of High-Index Dielectric Nanoparticles Oral [Show abstract]
  • Alessio Monti, Roma Tre University, Italy
  • Andrea Alù, CUNY Advanced Science Research Center, USA
  • Alessandro Toscano, Roma Tre University, Italy
  • Filiberto Bilotti, Roma Tre University, Italy
Due to their low losses and exotic response at optical frequencies, high-index dielectric nanoparticles are a promising candidate for many relevant nanophotonics applications. In this contribution, we investigate the use of arrays of dielectric nanoparticles for tailoring optical reflections. Two different categories of devices are considered: (i) ultra-thin all-reflection coatings and (ii) highly-efficient non-gradient anomalous reflectors. Through both theoretical arguments and full-wave simulations, it is proven that dielectric nanoparticles allow achieving high performances in both the scenarios enabling, thus, new degrees of freedom in the manipulation of optical reflections.
12:00 - 12:15 - On the Integration and Characterization of Chainmail-Like Hall-Effect Metamaterials Oral [Show abstract]
  • Christian Kern, Karlsruher Institut für Technologie, Germany
  • Muamer Kadic, Institut FEMTO-ST, Karlsruher Institut für Technologie, France, Germany
  • Martin Wegener, Karlsruher Institut für Technologie, Germany
We realize metamaterial Hall bars that are connected to printed circuit boards in a permanent manner. This brings this class of metamaterials closer to possible applications and facilitates our study of the isotropy of the sign reversal for cubic chainmail-like metamaterial unit cells.
12:15 - 12:30 - Towards a Physically Sound D-dot Transmission-Line theory model Oral [Show abstract]
  • Boris Okorn, Ruđer Bošković Institute, Croatia
  • Jordi Sancho-Parramon, Ruđer Bošković Institute, Croatia
  • Silvio Hrabar, University of Zagreb, Croatia
Recently, a novel paradigm of metatronics has been introduced. It offers optical nano-circuitry similar to RF electronics but based on manipulation of displacement current flow. A main conductor in metatronics is the D-dot wire structure. Here we introduce the idea of a D-dot transmission line that can be modelled using standard circuit theory.
10:30 - Theory and modeling II

Session chairperson(s): Ari Sihvola; Constantinos Valagiannopoulos

10:30 - 10:45 - Theory of Dual-Tunable Thin-Film Multiferroic Heterostructures with a Coplanar Transmission Line Oral [Show abstract]
  • Aleksei Nikitin, St. Petersburg Electrotechnical University, Russia
  • Alexey Ustinov, St. Petersburg Electrotechnical University, Russia
  • Andrey Nikitin, St. Petersburg Electrotechnical University, Russia
  • Erkki Lähderanta, Lappeenranta University of Technology, Finland
  • Boris Kalinikos, St. Petersburg Electrotechnical University, Russia
A theory of spin-electromagnetic wave (SEW) spectrum has been developed for a thin-film ferrite-ferroelectric structure based on a coplanar transmission line. The dispersion relation was derived through analytical solution of the full set of Maxwell`s equations utilizing a method of approximate boundary conditions. The distinctive features of the investigated structures are the thin-film planar topology and dual tunability of the SEW spectrum.
10:45 - 11:00 - Analysis Of Scatterers With Discontinuous Impedance Boundary Condition Using Surface-Integral-Equation Method Oral [Show abstract]
  • Beibei Kong, Aalto University, Finland
  • Pasi Ylä-Oijala, Aalto University, Finland
  • Maria Denise Astorino, ”La Sapienza” University of Rome, Italy
  • Henrik Wallen, Aalto University, Finland
  • Ari Sihvola, Aalto University, Finland
This contribution presents a surface-integral-equation-based computational method to analyze scattering by objects with strongly discontinuous surface impedance parameters. As an example of the application of the method, the response of a PEC-PMC sphere is analyzed, revealing unexpected and strongly anisotropic scattering behavior.
11:00 - 11:15 - Universal Expression for Poynting Vector Applicable for Evanescent Waves: Inherent Output from the Method of Single Expression Oral [Show abstract]
  • Tamara Knyazyan, National Polytechnic University of Armenia , Armenia
  • Hovik Baghdasaryan, National Polytechnic University of Armenia , Armenia
  • Tamara Hovhannisyan, National Polytechnic University of Armenia , Armenia
  • Marian Marciniak, National Institute of Telecommunications, Poland
An alternative expression for Poynting vector valid for evanescent waves is presented in the method of single expression (MSE). The boundary problem solution by the MSE permits to observe spatial distributions for electric, magnetic field amplitudes and Poynting vector. The suggested Poynting vector is in agreement with the traditional one.
11:15 - 11:30 - Theory of Characteristic Modes for Impedance Bodies Oral [Show abstract]
  • Pasi Ylä-Oijala, Aalto University, Finland
  • Henrik Wallen, Aalto University, Finland
  • Bei-Bei Kong, Aalto University, Finland
  • Seppo Järvenpää, Aalto University, Finland
The theory of characteristic modes, formulated with surface integral operators, is presented for closed objects with isotropic and position dependent surface impedances. The proposed method allows excitation-independent analysis of fundamental electromagnetic scattering properties of arbitrarily shaped impedance bodies.
11:30 - 11:45 - Discontinuous Transformation Optics For Surface Phenomena Oral [Show abstract]
  • Lieve Lambrechts, Vrije Universiteit Brussel, Belgium
  • Vincent Ginis, Vrije Universiteit Brussel / Harvard University, Belgium / USA
  • Jan Danckaert, Vrije Universiteit Brussel, Belgium
  • Philippe Tassin, Chalmers University of Technology, Sweden
We introduce an innovative way of using discontinuous coordinate tranformations to extend the geometrical formalism of transformation optics beyond the manipulation of light ray trajectories inside bulk media. Specifically, we demonstrate how discontinuous transformation optics can be used to design electromagnetic surface phenomena at the interface of man-made materials. As a first application of our approach, we show how the Goos-Hänchen effect can be understood and tailored from a geometrical point of view. In addition, we propose a similar approach for transition radiation.
11:45 - 12:00 - 50 Years of Negative Refraction Invited (15 minutes) [Show abstract]
  • Victor Georgievich Veselago, Institute of General Physics, Russian Academy of Sciences, Russia
50 years of negative refraction
12:00 - 12:15 - Retrieving Regular Photonic Structures Though Global Optimization Oral [Show abstract]
  • Antoine Moreau, Université Clermont Auvergne, France
  • Mamadou Aliou Barry, Université Clermont Auvergne, France
  • Vincent Berthier, INRIA, France
  • Marie-Claire Cambourieux, Université Clermont Auvergne, France
  • Rémi Pollès, Université Clermont Auvergne, France
  • Olivier Teytaud, INRIA, France
  • Emmanuel Centeno, Université Clermont Auvergne, France
  • Bodo Wilts, Fribourg University, Switzerland
  • Nicolas Biais, Brooklyn College, USA
Optimization tools are increasingly used, for instance for the design of metamaterials analog computers. Yet they have not so far been able to produce designs as regular as in nature or in technology like photonic crystals or metamaterials. Here we show that it is possible, using state of the art global optimization techniques, to obtain periodic or regular structures. Some algorithms seem particularly suited for the difficult problems that can be found in photonics. They can even be used to produce counter-intuitive but very efficient strutures for problems like light absorption in solar cells.
12:15 - 12:30 - Optimized Operation of Photonic Devices With Use of Ordinary Bulk Materials Oral [Show abstract]
  • Constantinos Valagiannopoulos, Nazarbayev University, Kazakhstan
Structural boundaries, materials and feeding sources are the three fundamental segments defining photonic devices. Since excitation is usually dictated by the application and there are infinite ways to select the spatial configuration of the component, an optimization with respect to the used media is both doable and useful. We provide several combinations of elements and compounds making high-performing electromagnetic devices in terms of absorption, scattering and unusual refraction with simple structures like bilayers, two- and three- dimensional core-shell particles or binary metasurfaces. Such large sets of potential candidates for the employed media can be deployed by experimentalists after applying a secondary sweep by imposing additional constraints concerning ease of fabrication.
12:30 - 14:00 - Lunch break (Tuesday)
14:00 - 15:30 - Oral sessions (Tuesday - afternoon 1)
14:00 - Special session: Recent advances and trends in metasurfaces II

Organizer(s): David Smith; Stefano Maci

Session chairperson(s): David Smith; Stefano Maci

14:00 - 14:30 - Singular Metasurfaces Invited oral [Show abstract]
  • John B. Pendry, Imperial College London, United Kingdom
Plasmonic systems are dominated by their surface structure which couples external radiation to the surface plasmons. I shall show how metasurfaces can be derived by a series of conformal transformations from a flat surface, enabling comprehensive analysis. When these transformations are singular, reflection spectra change dramatically. Non singular surfaces as in a conventional grating show absorption of a single colour dictated by the angle of incidence and the plasmon frequency. On the other hand singular surfaces have a broad band absorption spectrum and appear to be black. An instance of this is colloidal silver where the touching nanospheres create singularities. Unlike conventional gratings singular structures are characterised by three wave vectors not two: the third wave vector hidden, or “compacted” in the singularity.
14:30 - 15:00 - Recent Advances in Huygens’ Metasurfaces Invited oral [Show abstract]
  • George Eleftheriades, University of Toronto, Canada
  • Michael Chen, University of Toronto, Canada
  • Ayman Dorrah, University of Toronto, Canada
  • Gleb Egorov, University of Toronto, Canada
In this paper recent advances in Huygens’ metasurfaces are described. These include novel broadband and bi-anisotropic unit cells, as well as beam expansion for antenna directivity enhancement using phase-changing metasurfaces.
15:00 - 15:30 - Multiscale Modeling of Electrically Large Waveguide-Fed Metasurface Apertures using a Coupled Dipole Approach Invited oral [Show abstract]
  • D.R. Smith, Duke University, USA
  • L. Pulido-Mancera, Duke University, USA
  • P.T. Bowen, Duke University, USA
  • N.B. Kundtz, Kymeta Corporation, USA
Waveguide-fed metasurface apertures have seen intense development and widespread commercialization across a rising number of applications. The metasurface architecture inherently lends itself to an alternative, highly efficient, hybrid simulation approach. We summarize the waveguide-fed metasurface architecture, compare it with other aperture concepts and introduce the dipole and coupled-dipole model modeling platform. We find excellent agreement between full-wave simulations and the coupled-dipole approach in the cases examined.
14:00 - Acoustic metamaterials II

Session chairperson(s): Olivier Mondain Monval; Romain Fleury

14:00 - 14:15 - Soft Porous Metamaterials for Acoustics Oral [Show abstract]
  • Raj Kumar, University of Bordeaux, France
  • Yabin Jin, University of Bordeaux, France
  • Olivier Poncelet, University of Bordeaux, France
  • Thomas Brunet, University of Bordeaux, France
  • Artem Kovalenko, University of Bordeaux, France
  • Olivier Mondain Monval, University of Bordeaux, France
We present a new method to prepare soft porous materials with fully tunable values of the acoustic refraction index. The index value depends on the sample porosity and mechanical properties through a very simple model expression. Our study paves the way to the realization of gradient index materials and metasurfaces allowing for new directional, focusing or attenuating properties.
14:15 - 14:30 - Doubly Negative Bubbly Metamaterials Oral [Show abstract]
  • Maxime Lanoy, University of Manitoba, Canada
  • John H. Page, University of Manitoba, Canada
  • Geoffroy Lerosey, Institut Langevin, France
  • Fabrice Lemoult, Institut Langevin, France
  • Valentin Leroy, Université Paris Diderot, France
  • Arnaud Tourin, Institut Langevin, France
Thanks to their particularly efficient, low frequency Minnaert resonance, air bubbles are known to be excellent candidates for the realization of acoustic metamaterials. Here, we demonstrate that the introduction of pair-wise spatial correlations between the bubbles can result in double negativity. This can occur when the bubble pairs are arranged either in random or periodic configurations. Predictions for both types of structure will be presented and the influence of dissipation on the doubly negative behaviour discussed.
14:30 - 14:45 - Nonlinear Elastic Metasurface Design Achieving Acoustic Wave Scattering Control Oral [Show abstract]
  • Xinxin Guo, Le Mans Université, France
  • Vitalyi E. Gusev, Le Mans Université, France
  • Katia Bertoldi, Harvard University, USA
  • Vincent Tournat, Le Mans Université, France
The acoustic wave scattering properties of a nonlinear elastic metasurface, through different metasurface designs, derived from resonant nonlinear elastic elements, are theoretically and numerically studied. The results indicate the possibility of converting, during the reflection/transmission process, most of the fundamental incoming wave energy into the second harmonic wave.
14:45 - 15:00 - Envelope Solitons in 1D Acoustic Metamaterials Oral [Show abstract]
  • Jiangyi Zhang, Université du Maine, France
  • Vicente Romero-García, Université du Maine, France
  • Georgios Theocharis, Université du Maine, France
  • Olivier Richoux, Université du Maine, France
  • Vassos Achilleos, Université du Maine, France
  • Dimitrios J. Frantzeskakis, National and Kapodistrian University of Athens, Greece
In this work, we study analytically and numerically envelope (bright, gap, black and gray) solitons in one-dimensional weakly lossy nonlinear acoustic metamaterials with effective negative material characteristics (effective negative mass density or bulk modulus). Our numerical and analytical results are found to be in good agreement.
15:00 - 15:15 - Acoustic Metamaterials Crystal for Passive Parity-Time-Symmetric Modulation Oral [Show abstract]
  • Tuo Liu, The Hong Kong Polytechnic University, Hong Kong
  • Jie Zhu, The Hong Kong Polytechnic University, Hong Kong
The exploration of parity-time (PT) symmetry with classical wave systems has enabled many counter-intuitive ways of wave manipulation and innovative applications, yet is still a great challenge for sound waves due to the lack of acoustic gain medium in nature. Here we report the realization of an acoustic metamaterials crystal that respects passive PT symmetry, by interleaving groove- and holey-structured metamaterials to offer intrinsic PT-symmetric potential without any active element. At the exceptional point where a transition from the unbroken to broken PT symmetry phase happens, unidirectional sound reflectionless effect is numerically achieved. Our demonstration provides a feasible path to the investigation of PT symmetry in acoustic wave system with practical structures free of gain medium.
15:15 - 15:30 - Mechanism of Sound Detection in Human Hearing System Based on Extraordinary Acoustic Transmission Oral [Show abstract]
  • Yasushi Horii, Kansai University, Japan
  • Wenjia Hong, Kansai University, Japan
  • Airi Tamaki, Kansai University, Japan
  • Toshiaki Kitamura, Kansai University, Japan
This paper proposes a new sound detection theory of human hearing system based on extraordinary acoustic transmission. From engineering point of view, resonance on enlarged hair cell models are demonstrated theoretically. This new idea can be applied to super-compact hair cells to account for mechanism of human hearing system.
14:00 - Plasmonics III

Session chairperson(s): Viktor Podolskiy; Filipa Rodrigues

14:00 - 14:15 - Wideband Filters Based On Spoof Localized Surface Plasmon Resonators Oral [Show abstract]
  • Xuanru Zhang, Southeast University, China
  • Zuqi Fang, Southeast University, China
  • Di Bao, Southeast University, China
  • Tie Jun Cui, Southeast University, China
Spoof localized surface plasmon (SLSP) resonators with underlayer ground plane are investigated under monopole antenna excitation. Wideband bandpass SLSP filters are validated. The SLSP filters exhibit wide passbands in compact sizes and balanced shapes, while holding satisfactory spurious rejection bands and group delays.
14:15 - 14:30 - Extraordinary Optical Transmission via Hybridization of Core-cavity Plasmon Modes Oral [Show abstract]
  • Bilge Can Yildiz, Atilim University, Turkey
  • Alireza Rahimi Rashed, Tampere University of Technology, Finland
  • Humeyra Caglayan, Tampere University of Technology, Finland
We demonstrate that extraordinary optical transmission through a periodic hole array of gold nanostructure is considerably enhanced when there are gold nano-cores inside these holes. We explain this phenomenon by hybridization of surface plasmon polariton (SPP) and localized surface plasmon (LSP) modes excited on the nano-holes and the nano-cores, respectively, at different wavelengths, giving rise to the transfer of more energy to the transmitted light, compared to the case where only the SPP modes are excited.
14:30 - 14:45 - Metallic Nanoparticle-Array Lasers with Ultrafast Modulation Speeds and Highly Directional Beam Oral [Show abstract]
  • Konstantinos Daskalakis, Aalto University, Finland
  • Aaro Väkeväinen, Aalto University, Finland
  • Jani-Petri Martikainen, Aalto University, Finland
  • Tommi Hakala, Aalto University, Finland
  • Päivi Törmä, Aalto University, Finland
In this paper we demonstrate an organic dye nanolaser that exhibits ultrafast modulation speed and high beam directionality. The studied nanolaser consists of arrays of cylindrical gold nanoparticles with a diameter of 100 nm and a height of 30 nm, arranged in a square lattice. The periodicity is varied between 550 – 590 nm. To probe the lasing properties, IR-140 dye (5,5΄-dichloro-11- diphenylamine-3,3΄-diethyl-10,12-ethylene-thiatricarbocyanine-perchlorate), in low concentration solutions is deposited on the sample. In this configuration, the sample exhibit lasing at room temperature at infrared wavelength (~ 880 nm).
14:45 - 15:00 - Fabrication, Characterization and Applications of a Gradient Refractive Index Plasmonic Metamaterial Oral [Show abstract]
  • R. Margoth Córdova-Castro, King's College London, United Kingdom
  • Brian Wells, University of Hartford, USA
  • Alexey V. Krasavin, King's College London, United Kingdom
  • Mazhar E. Nasir, King's College London, United Kingdom
  • Wayne Dickson, King's College London, United Kingdom
  • Victor A. Podolskiy, University of Massachusetts, Lowell, USA
  • Anatoly V. Zayats, King's College London, United Kingdom
We investigate the engineered optical properties in a plasmonic nanocone metamaterial, fabricated via a manufacturing process which allow very high density of hot spot over a large area. Such anisotropic metamaterial behaves as a transitional metamaterial with gradient of a refractive index across its thickness.
15:00 - 15:15 - Resonant Graded-Index Plasmonic Nanoscatterers: Enabling Unusual Light-Matter Interactions Oral [Show abstract]
  • Dimitrios Tzarouchis, Aalto University and University of Pennsylvania, Finland and USA
  • Nader Engheta, University of Pennsylvania, USA
  • Ari Sihvola, Aalto University, Finland
Light scattering by a subwavelength sphere exhibiting a radially inhomogeneous permittivity profile is considered here. A generalization of the polarizability for radially inhomogeneous sphere is given in terms of a so-called inhomogeneity factor. The special case of an inhomogeneous Drude profile unveils a series of scattering peculiarities, motivating further discussion for the implementation of spheres with graded-index plasmonic profiles.
15:15 - 15:30 - Lasing in Dark and Bright Modes of Plasmonic Nanoarrays Oral [Show abstract]
  • Tommi Hakala, Aalto University, Finland
  • Heikki Rekola, Aalto University, Finland
  • Aaro Vakevainen, Aalto University, Finland
  • Jani-Petri Martikainen, Aalto University, Finland
  • Marek Necada, Aalto University, Finland
  • Antti Moilanen, Aalto University, Finland
  • Paivi Torma, Aalto University, Finland
We show lasing at the visible wavelengths in both bright and dark modes of the plasmonic nanoparticle array.
14:00 - Magnetic-resonance-imaging applications

Session chairperson(s): Stefan ENOCH; Pavel Belov

14:00 - 14:30 - Metamaterials for Ultra-high Field MRI. M-Cube Project: Objectives and Some Results Invited oral [Show abstract]
  • Redha Abdeddaim, Aix-Marseille Université, Institut Fresnel, France
  • Stefan Enoch, Aix-Marseille Université, Institut Fresnel, France
We will present the main challenges in the development of routine clinical use of ultra-high field MRI and opportunities for metamaterials for ultra-high field MRI. Then results obtained by the M-Cube project consortium will be presented.
14:30 - 15:00 - Tunability Methods for Magnetic Resonance Imaging Applications of Metasurfaces Invited oral [Show abstract]
  • Alena Schelokova, ITMO University, Russia
  • Ekaterina Brui, ITMO University, Russia
  • Stanislav Glybovskiy, ITMO University, Russia
  • Alexey Slobozhanyuk, ITMO University, Russia
  • Irina Melchakova, ITMO University, Russia
  • Pavel Belov, ITMO University, Russia
In this work, we propose and discuss methods of tuning eigenmode resonance frequencies of wire metasurfaces. Fine tuning of metasurface properties is essential for maximizing its coupling with transmitting and receiving radiofrequency (RF) coils of a magnetic resonance imaging (MRI) system. We have studied numerically and experimentally two designs of metasurfaces with different tunability mechanisms. The first design is a hybrid structure based on periodic wires with extremities penetrating high-permittivity dielectric volumes, where tunability achieved by changing properties of the dielectric parts. The second metasurface is formed by an array of capacitively loaded telescopic wires that permit to adjust the eigenmode resonance frequencies by mechanical expansion of the wires. Both metasurfaces demonstrated the spectacular capability to locally enhance the magnetic field of an external RF coil being precisely tuned to the Larmor frequency of a clinical MRI scanner.
15:00 - 15:15 - A Single Unit Cell Metasurface for Magnetic Resonance Imaging Applications Oral [Show abstract]
  • Tingzhao Yang, University of Sheffield, United Kingdom
  • Kenneth Ford, University of Sheffield, United Kingdom
  • Madhwesha Rao, University of Sheffield, United Kingdom
  • James Wild, University of Sheffield, United Kingdom
This paper describes a method for designing a non-periodic metasurface for use in 1.5T magnetic resonance imaging applications. The use of an inter-digitated capacitive surface combined with a circular radio frequency transceiver coil is shown to improve the magnetic flux density whilst being compact in cross section and thickness. By using a single unit cell structure the magnetic flux density, which is proportional to signal to noise ratio (SNR), was improved by a maximum of 120%. The single unit cell design also offers a more uniform magnetic flux density distribution when compared to periodic metamaterial approaches.
15:15 - 15:30 - Investigation of Metasurface Eigenmode Impact on Receive Sensitivity Enhancement of MRI Machine Oral [Show abstract]
  • Egor Kretov, ITMO University, Russia
  • Alena Shchelokova, ITMO University, Russia
  • Alexey Slobozhanyuk, ITMO University, Russia
Magnetic resonance image quality directly depends on the signal-to-noise ratio provided by the receive coil. It was recently shown that wire metasurface can enhance the signal-to-noise ratio of the commercial scanner due to the spatial redistribution of the radiofrequency electromagnetic field through the resonant excitation of a wire metasurface eigenmode. In this work, we experimentally investigate the impact of this eigenmode on receive sensitivity enhancement of the 1.5 T birdcage coil. We proof that due to the certain spatial profile of the metasurface eigenmode, signal-to-noise ratio enhancement directly depends on the position and dimensions of the studied object on the metasurface.
15:30 - 16:00 - Coffee break (Tuesday afternoon)
16:00 - 17:30 - Oral sessions (Tuesday - afternoon 2)
16:00 - Exotic effects and properties II

Session chairperson(s): Davide Ramaccia; Carsten Rockstuhl

16:00 - 16:15 - Contribution to the Theory of THz Laser Based on Asymmetrical Hyperbolic Media Oral [Show abstract]
  • Olga Kozina, Kotel’nikov Institute of Radio-Engineering and Electronics, Russia
  • Leonid Melnikov, Yuri Gagarin State Technical University of Saratov, Russia
  • Igor Nefedov, Aalto University, Finland
Theory of a nonlinear wave propagation in a complex cavity which contains the graphene-based asymmetric hyperbolic metamaterial is suggested. The THz gain saturation in an active medium slab is taken into account.
16:15 - 16:30 - Disorder-Induced Phase Transition in Dielectric Metasurfaces Oral [Show abstract]
  • Aso Rahimzadegan, Karlsruhe Institute of Technology, Germany
  • Dennis Arslan, Friedrich Schiller University Jena, Germany
  • Stefan Fasold, Friedrich Schiller University Jena, Germany
  • Matthias Falkner, Friedrich Schiller University Jena, Germany
  • Thomas Pertsch, Friedrich Schiller University Jena, Germany
  • Isabelle Staude, Friedrich Schiller University Jena, Germany
  • Carsten Rockstuhl, Karlsruhe Institute of Technology, Germany
The complex behaviour of light in disordered materials has some intriguing features, which motivates its exploration. Here, we study a disorder induced phase transition in a dielectric Huygens' metasurfaces made from silicon nano-disks supporting electric and magnetic resonances. Depending on the disorder, the phase of the transmitted field undergoes a phase transition from normal to anomalous dispersion above a critical threshold. The threshold also depends on the detuning among the electric and magnetic resonance. For detuning in excess, a third phase emerges where both resonances appear isolated. The effect can nicely be explored while considering a Lorentzian resonance profile for the disks but is also revealed in full-wave simulations and in experiments. Uncovering this novel phenomenon is an important milestone in the growing fields of both, metamaterials and disordered photonics.
16:30 - 17:00 - Metasurface-Based Doppler Cloaks: Time-Varying Metasurface Profile to Achieve Perfect Frequency Mixing Extended oral [Show abstract]
  • Davide Ramaccia, RomaTre University , Italy
  • Dimitrios Sounas, University of Texas at Austin, USA
  • Andrea Alù, University of Texas at Austin, United States
  • Alessandro Toscano, RomaTre University, Italy
  • Filiberto Bilotti, RomaTre University, Italy
Doppler cloaks are spatiotemporally modulated metamaterial covers to be placed in front or wrapped around a moving object to restore locally the source illumination frequency, as if it were not in motion. Although the cloak effectively compensates such a frequency shift, the required thickness of the metamaterial is in the order of dozens of wavelengths of the incident signal for ensuring a complete energy transfer from the Doppler shifted to the original source frequency. In this contribution, we present a bi-dimensional version of the Doppler cloak, realized by a time-varying metasurface with proper time-dependent transmission coefficient. The temporal profile of the transmission coefficient is defined for achieving the same frequency mixing behavior of bulk Doppler cloaks. The operation is verified by a full-wave FDTD numerical simulation in case of normal incidence.
17:00 - 17:30 - Independent Manipulation of Amplitude and Phase of Light based on the de Broglie-Bohm Viewpoint Invited oral [Show abstract]
  • Sunkyu Yu, Seoul National University, South Korea
  • Xianji Piao, Seoul National University, South Korea
  • Namkyoo Park, Seoul National University, South Korea
In this talk, we introduce the concept of “Bohmian photonics” for the design of optical structures, to achieve the independent manipulation of amplitude and phase of light. As representative examples, the design strategies of phase-conserved energy confinement and annihilation, and constant-intensity waves are discussed.
16:00 - Mechanical and acoustic metamaterials

Session chairperson(s): Aurélien Merkel; Bogdan Ungureanu

16:00 - 16:15 - Some Challenges Regarding Cloaking And Earthquake Protection Oral [Show abstract]
  • Sebastien Guenneau, Institut Fresnel, France
  • Stephane Brule, Institut Fresnel, France
  • Stefan Enoch, Institut Fresnel, France
  • Andre Diatta, Institut Fresnel, France
  • Younes Achaoui, Institut Fresnel, France
  • Bogdan Ungureanu, Imperial College London, United-Kingdom
  • Harsha Hutridurga, Imperial College London, United-Kingdom
  • Richard Craster, Imperial College London, United-Kingdom
Building upon analogies with cloaking of elastic waves in plates, a large scale experiment has demonstrated unprecedented control of surface seismic waves in structured soils. Here, we would like to review recent research advances and remaining challenges in the theory and applications of seismic metamaterials for cloaking and earthquake protection. We recall some results on transformation elastodynamics and introduce mathematical theory of near cloaking for elastic equations. The former is a natural framework for scattering problems in unbounded domains, while the latter addresses boundary measurements in bounded domains. These two fields of investigation bring complementary information on cloaking efficiency. Intimate links between cloaking and wave protection will be also discussed.
16:15 - 16:30 - Sound Propagation in a One-Dimensional PT Symmetric Sonic Crystal Oral [Show abstract]
  • María Rosendo López, Universidad Carlos III de Madrid, Spain
  • Aurélien Merkel, Universidad Carlos III de Madrid, Spain
  • Johan Christensen, Universidad Carlos III de Madrid, Spain
Parity-Time (PT ) symmetric structures based on balanced distributions of gain and loss have attracted significant attention in acoustics metamaterials researches since they allow one to sculpture the flow of sound waves in complete new ways. We compute Bloch states in periodic fluidic stacks into which a spatially variation of gain and loss components are distributed. The complex acoustic band diagram exhibit modes coalescence, various exceptional points beyond which acoustic Bloch states are allowed to either amplify or attenuate sound within the PT broken phase.
16:30 - 16:45 - Platonic Quasicrystal for Flatlens Focusing of Flexural Waves Oral [Show abstract]
  • Kun Tang, Bar Ilan University, Israel
  • Sebastien Guenneau, Aix-Marseille University, France
  • Patrick Sebbah, Bar-Ilan University, Israel
Negative refraction and flat lens focusing of elastic waves has been recently demonstrated experimentally, though restricted to periodic structures where dispersion relations are readily available for prediction and design of superlenses. This is not possible anymore when considering quasiperiodic structures. Here we demonstrate quasicrystal platonic superlensing of elastic waves in perforated metallic thin plates, opening new possibilities for applications of quasiperiodic structures in elastic waves.
16:45 - 17:00 - Design of a Chiral Elastic Structure Supporting Interfacial Waveforms Oral [Show abstract]
  • Michael Nieves, Keele University/University of Cagliari, UK
  • Marta Garau, Keele University, UK
  • Giorgio Carta, Liverpool John Moores University, UK
  • Ian Jones, Liverpool John Moores University, UK
  • Natasha Movchan, University of Liverpool, UK
  • Alexander Movchan, University of Liverpool, UK
An infinite heterogeneous elastic triangular lattice connected to a non-uniform array of gyroscopic spinners is considered. An algorithm is described for generating interfacial waves that propagate along the boundaries of subdomains containing inhomogeneities in the spinner array. The interfacial waveforms have preferential directions that can be controlled through adjusting the frequency of excitation or the arrangement of the spinners.
17:00 - 17:00 - The Anisotropy of Layered Bathymetries for Water Waves Withdrawn [Show abstract]
  • Agnès Maurel, I. Langevin,, France
  • Jean-Jacques Marigo, LMS/Ecole Polytechnique, France
  • Pablo Cobelli, Univ. Buenos Aires and IFIBA, Argentina
  • Philippe Petitjeans, PMMH/ESPCI, France
  • Vincent Pagneux, Univ. du Mans, France
Experimental and theoretical results show that layered bathymetries for water waves allow to obtain effective medium with significant anisotropy. The theory is based on the homogenization technique applied to the fully three-dimensional water wave problem. It agrees very well with experimental measurements.
17:00 - 17:15 - Sound Transmission Loss of Locally Resonant Metamaterial and Phononic Crystal Plates Oral [Show abstract]
  • Lucas Van Belle, KU Leuven, Belgium
  • Claus Claeys, KU Leuven, Belgium
  • Elke Deckers, KU Leuven, Belgium
  • Wim Desmet, KU Leuven, Belgium
This paper investigates the sound transmission loss of locally resonant metamaterial and phononic crystal plates using unit cell and finite plate analysis. Plates with flexural wave stop bands can lead to enhanced vibro-acoustic performance. The acoustic insulation performance and frequency range depends, however, on the underlying stop band mechanism. While unit cell analysis suggests sound transmission loss improvements regardless of the mechanism, the vibro-acoustic performance of their finite plate counterparts can differ significantly.
17:15 - 17:30 - Symmetry Induced Broadband Transmission Enhancement Through Opaque Barriers Coated by Opaque Disordered Slabs Oral [Show abstract]
  • Elie Chéron, Université du Mans, France
  • Simon Félix, Université du Mans, France
  • Vincent Pagneux, Université du Mans, France
We show in multimodal quasi-1D waveguides that constructive interference effects caused by the addition of two symmetrical disordered slabs provide a significant and broadband increase of transmission through opaque barriers. Numerical simulations and a model are presented in order to tune and optimize this gain in transmission.
16:00 - Graphene

Session chairperson(s): Mona Jarrahi; Hossein Mosallaei

16:00 - 16:30 - Gold-Patched Graphene Nano-Stripes for Photodetection with Unprecedented Functionalities Invited oral [Show abstract]
  • Mona Jarrahi, UCLA, USA
  • Semih Cakmakyapan, UCLA, USA
  • Ping Keng Lu, UCLA, USA
We present engineered photoconductive nanostructures based on gold-patched graphene nano-stripes, which enable simultaneous broadband and ultrafast photodetection with high responsivity. These nanostructures merge the advantages of broadband optical absorption, ultrafast photocarrier transport, and carrier multiplication in graphene nano-stripes with the ultrafast transport of photocarriers to the gold patches before recombination. Through this approach, high-responsivity operation is achieved without the use of bandwidth- and speed-limiting quantum dots, defect states, or tunneling barriers.
16:30 - 16:45 - Enhanced Tunability of Metasurfaces with Graphene Oral [Show abstract]
  • Humeyra Caglayan, Tampere University of Technology, Finland
  • Mohsin Habib, Bilkent University, Turkey
  • Ekmel Ozbay, Bilkent University, Turkey
  • Alireza Rahimi Rashed, Tampere University of Technology, Finland
We present graphene-gold metasurfaces to enhance light-graphene interaction in the MIR region and additionally, we demonstrate a new class of electrically controlled active metadevices working in microwave frequencies. The results show that electrical gating of graphene allows actively tuning the resonance wavelength.
Media link(s):

http://advances.sciencemag.org/content/4/1/eaao1749

16:45 - 17:00 - Electromagnetic Crystalline Metamaterial With Subwavelength Dirac Cones Oral [Show abstract]
  • Simon Yves, Institut Langevin, France
  • Fabrice Lemoult, Institut Langevin, France
  • Thomas Berthelot, CEA Saclay and KELENN Technology, France
  • Mathias Fink, Institut Langevin, France
  • Geoffroy Lerosey, Institut Langevin, France
Graphene, a honeycomb lattice of carbon atoms ruled by tight-binding interactions, exhibits extraordinary electronic properties, due to Dirac cones within its band structure. We present an experimental electromagnetic analog of graphene obtained with crystalline metamaterials made of simple copper wires and we demonstrate the presence of subwavelength Dirac cones.
17:00 - 17:15 - Singular Graphene Metasurfaces Oral [Show abstract]
  • Emanuele Galiffi, Imperial College, United Kingdom
  • P.A. Huidobro, Imperial College, United Kingdom
  • J.B. Pendry, Imperial College, United Kingdom
The dynamic tunability of graphene enables the engineering of metasurfaces such as conductivity gratings, which couple incident radiation to surface plasmons. Here we discuss singular graphene metagratings, whose conductivity is strongly suppressed. These surfaces are found to exhibit remarkably broadband THz response, thus functioning as efficient broadband absorbers. By analytically characterising their response via transformation optics, we provide an intuitive understanding of the interaction of light with these surprisingly exotic metastructures.
Media link(s):

The following works are relevant to the paper:

http://science.sciencemag.org/content/358/6365/915.long

https://pubs.acs.org/doi/abs/10.1021/acsnano.7b07951

https://pubs.acs.org/doi/abs/10.1021/acsnano.6b01944

17:15 - 17:30 - Graphene-Based Tunable Metasurface for All-Angle Perfect Absorption Oral [Show abstract]
  • Xuchen Wang, Aalto University, Finland
  • Sergei Tretyakov, Aalto University, Finland
Motivated by the idea of “smart” metasurfaces, we will demonstrate a graphene-based tunable absorber in which perfect absorption can be achieved for all angles of incidence, only by tuning the Fermi level of graphene. We place an unpatterned graphene sheet on a mushroom-type high impedance surface whose resonant frequency is stable for all incident angles. For TM-polarization, perfect absorption can be realized from normal to grazing incidence at the same frequency when modulating the Fermi level of graphene from 0.18 eV to 1 eV.
16:00 - Antenna applications

Session chairperson(s): Mirko Barbuto; Richard Ziolkowski

16:00 - 16:15 - Design of a Patch Antenna with a Sector Radiation Pattern by Exploiting Topological Properties of Vortex Fields Oral [Show abstract]
  • Mirko Barbuto, Niccolò Cusano University, Italy
  • M.-A. Miri, University of Texas at Austin, USA
  • Andrea Alù, University of Texas at Austin, USA
  • Filiberto Bilotti, Roma Tre University, Italy
  • Alessandro Toscano, Roma Tre University, Italy
Topological properties of vortex fields have witnessed an increasing attention due to a wide spread of possible applications at both microwave and optical frequencies. In particular, we have recently shown that composite vortices, i.e. superposition of vortex fields with different topological charges, can be exploited to manipulate the radiation pattern of a microwave patch antenna. In this contribution, we further explore the generation and manipulation of composite vortices in order to design a single patch antenna that exhibits a sector radiation pattern and emulates the radiation properties of a dipole placed at a quarter of wavelength from a reflector.
16:15 - 16:30 - Fully-metallic, Low-dispersive, Leaky-wave Fed Lens Antenna for 60 GHz Base Station Applications Oral [Show abstract]
  • Oskar Dahlberg, KTH Royal Institute of Technology, Sweden
  • Elena Pucci, Ericsson AB, Systems & Technology, Sweden
  • Lei Wang, Hamburg University of Technology, Germany
  • Oscar Quevedo-Teruel, KTH Royal Institute of Technology, Sweden
The guiding structure commonly employed in leaky-wave antennas is dispersive, resulting in beam-steering with frequency. This behavior reduces operational bandwidth in point-to-point communication applications. In this work, we present an approach that aims at increasing the operational bandwidth of leaky-wave antennas by the employment of a metasurface lens.
16:30 - 17:00 - Metamaterial-inspired Compact Directive Antenna Systems Invited oral [Show abstract]
  • Richard W. Ziolkowski, University of Technology Sydney, Australia
Huygens dipole and multipole antennas are briefly reviewed. These electrically small systems provide enhanced directivity, a feature highly desired for current and future wireless platforms. The design, simulation, fabrication, and measurement results for the Huygens dipole antennas are discussed. The Huygens multipole antenna concepts are described. These brief examinations will be greatly expanded upon during my presentation.
17:00 - 17:15 - Multiple Scattering Enabled Superdirectivity From A Subwavelength Ensemble Of Resonators Oral [Show abstract]
  • Samuel Métais, Institut Langevin, France
  • Fabrice Lemoult, Institut Langevin, France
  • Geoffroy Lerosey, Institut Langevin, France
Locally resonant metamaterial allow great control on the near field of incoming waves. Here we harness multiple scattering around a single source in a finite size array of subwavelength resonators of optimized size, in order to achieve control over the farfield emission, reaching superdirectivity in the microwave domain.
17:15 - 17:30 - Analysis of Elliptical Aperture Metasurface Antennas Oral [Show abstract]
  • Modeste Bodehou, Université catholique de Louvain, Belgium
  • Simon Hubert, Université catholique de Louvain, Belgium
  • Husnain Ali Kayani, Université catholique de Louvain, Belgium
  • Christophe Craeye, Université catholique de Louvain, Belgium
  • Isabelle Huynen, Université catholique de Louvain, Belgium
A Method of Moments (MoM) based analysis is presented for elliptical aperture metasurface (MTS) antennas. The MTS is represented as a sheet transition impedance boundary condition incorporated in a transmission line which accounts for the substrate interaction with the patches layer. The algorithm uses the Fourier-Bessel basis functions (FBBFs) and is inspired from the circular domain analysis. The computation time is then comparable to that of an equivalent size circular aperture MTS. Numerical results obtained with the proposed method are compared with the full wave Contour-FFT (CFFT) based MoM simulation of a MTS implemented with sub-wavelength printed patches.
17:30 - 19:30 - Social event: Excursion to Haltia
29 August 2018 / Start time: 9 h 0 min
09:00 - 10:00 - Plenary session III
09:00 - Plenary session III

Session chairperson(s): Filiberto Bilotti

09:00 - 10:00 - Metamaterials for Informatics Plenary [Show abstract]
  • Nader Engheta, University of Pennsylvania, USA
We explore how metastructures can be designed to perform analog computing and to solve integral equations using wave interaction in such structures. We consider two platforms for this purpose: (1) inhomogeneous metamaterials, and (2) collection of Mach-Zehnder interferometers (MZIs). We show how wave-matter interaction can be a tool to do “photonic mathematics” and information processing with metamaterials.
10:00 - 10:30 - Coffee break (Wednesday morning)
10:30 - 12:30 - Oral sessions (Wednesday morning)
10:30 - Special session: Physical Review Journals Symposium

Organizer(s): Thomas Pattard; Ling Miao; Julie Kim-Zajonz; Manolis Antonoyiannakis; Mu Wang

Session chairperson(s): Thomas Pattard; Ling Miao; Julie Kim-Zajonz; Manolis Antonoyiannakis; Mu Wang

10:30 - 11:00 - Local Densities of States in Photonic Systems with Loss and Material Dispersion Invited oral [Show abstract]
  • Christian Wolff, University of Southern Denmark, Denmark
  • Kurt Busch, Max-Born-Institut Berlin and Humboldt-Universitaet zu Berlin, Germany
  • N. Asger Mortensen, University of Southern Denmark, Denmark
We report on our recent progress in developing expressions for the complex bandstructure derivative and the density of transverse optical states (tDOS) using an adjoint mode formalism. We illustrate the usefulness by discussing the analytically solvable problem of a lossless dielectric band gap material perturbed by one sharp Lorentzian material resonance.
11:00 - 11:30 - Programmable Metastructures: Rainbow Trapping and Anisotropy Correction Invited oral [Show abstract]
  • Stefano Gonella, University of Minnesota, USA
  • Paolo Celli, California Institute of Technology, USA
  • Weiting Zhang, University of Minnesota, USA
In this work, we explore the opportunities for tunable wave manipulation in metastructures endowed with programmable mechanical characteristics. Programmability is here obtained through electromechanical control. Specifically piezoelectric shunts are intelligently distributed in the mechanical domain and used to convert certain elastic elements into electromechanical resonators. By taking advantage of tunable components in the electric circuits that are shunted to the piezo patches we can semi-actively modify the resonant frequencies of the resonators, thus tuning the response of the entire metastructure to specific frequencies of interest. The approach is first tested in the context of metamaterial waveguides. The waveguides are shown to work as tunable rainbow traps capable of variable and broadband mechanical filtering and as programmable mechanical signal jammers. The same concept is then extended to lattice structures, in which waves propagate with highly directional and frequency-selective spatial patterns. Tunability via piezo shunting is here exploited to induce a programmable correction of the intrinsic anisotropy of the lattices. A purely mechanical version of the same paradigm is also presented, relying on telescopic slender structures to realize forests of tunable resonators on the surface of thin vibrating sheets.
11:30 - 12:00 - Engineering Dissipation in Photonic and Phononic Systems for Non-Reciprocal Quantum Interactions Invited oral [Show abstract]
  • Aashish Clerk, University of Chicago, USA
The last few years have seen an ever-growing amount of interest in non-reciprocal photonic systems where the directionality results from driving the system, and not from the use of magnetic or magneto-optic materials. The motivation here ranges from new design principles for photonic devices, to the realization of novel kinds of correlated photonic physics. In this talk, I'll give an overview of recent work in my group exploring how engineered dissipation can be used to make almost any kind of interaction between two subsystems non-reciprocal (i.e. unidirectional). This provides a unified approach for discussing synthetic non-reciprocity in a range of different systems, and also a powerful means to design new kinds of non-reciprocal systems (both classical and quantum). I will touch on connections to quantum-limited amplification, quantum state preparation and measurement-based quantum feed-forward protocols, and also discuss recent implementations of our ideas in quantum optomechanics.
12:00 - 12:30 - Metasurface Polarization Optics: Independent Phase Control of Arbitrary Orthogonal States of Polarization Invited oral [Show abstract]
  • Federico Capasso, Harvard University, USA
Abstract
10:30 - Nonlinear metamaterials I

Session chairperson(s): Natalia Litchinitser; Alex Schuchinsky

10:30 - 10:45 - Metallic Nanoarc Antennas – Plasmonics Building Blocks for Non-Linear Optical Metamaterials Oral [Show abstract]
  • Kunyi Zhang, University of Maryland, USA
  • Ekaterina Poutrina, UES Inc., Dayton OH, USA
  • Augustine Urbas, Air Force Research Laboratory, USA
  • Oded Rabin, University of Maryland, USA
The linear and non-linear optical properties of metallic nanoarcs were investigated. The resonance frequencies in the NIR spectrum were correlated to geometric and materials parameters, primarily the nanoarc length and the permittivity of the substrate. Metamaterials consisting of arrays of arcs were designed to display enhanced Second Harmonic Generation at a predictable frequency. The enhancement is achieved through a double-resonance matching condition between the incident and emitted light and two plasmon resonances of individual nanoarcs. Larger nanoarc central angles lead to higher linear extinction cross-section at the second longitudinal mode resonance and larger second harmonic generation signal. The metamaterial consist of common, low-cost materials with no intrinsic second-order susceptibility.
10:45 - 11:00 - Gap Solitons in Double-Lorentz Nonlinear Metamaterials Oral [Show abstract]
  • Polykarpos Porfyrakis, Aristotle University of Thessaloniki, Greece
  • Nikolaos Tsitsas, Aristotle University of Thessaloniki, Greece
  • Dimitri Frantzeskakis, University of Athens, Greece
A nonlinear metamaterial, characterized by a double-Lorentz model of its frequency-dependent linear effective permittivity and permeability, is considered. The formation of gap solitons in the two frequency band gaps of this metamaterial is investigated analytically.
11:00 - 11:30 - Ultrafast Polarisation Control with Metamaterials Invited oral [Show abstract]
  • Anatoly Zayats, King's College London, United Kingdom
Plasmonic and dielectric metamaterials allow designing not only linear but also nonlinear optical response, such as Kerr-nonlinearity and harmonic generation. We will discuss applications of anisotropic plasmonic metamaterials and metasurfaces in active control of polarisation state of transmitted and reflected light on ultrafast timescales.
11:30 - 12:00 - Light-Matter Interactions in Engineered Nonlinear Photonic Media Invited oral [Show abstract]
  • Natalia Litchinitser, University at Buffalo, The State University of New York, USA
  • Jingbo Sun, University at Buffalo, The State University of New York, USA
  • Wiktor Walasik, University at Buffalo, The State University of New York, USA
  • Mikhail Shalaev, University at Buffalo, The State University of New York, USA
  • Yun Xu, University at Buffalo, The State University of New York, USA
  • Jesse Frantz, US Naval Research Laboratory, USA
  • Jason Myers, US Naval Research Laboratory, USA
  • Robel Bekele, US Naval Research Laboratory, USA
  • Jasbinder Sanghera, US Naval Research Laboratory, USA
  • Alexander Tsukernik, University of Toronto, Canada
Recent progress in the development of artificial materials, or metamaterials, with fundamentally new physical properties opens new opportunities for tailoring the properties of nanostructures and of light beam themselves. In the first part of this talk, we discuss the experimental demonstration of the evolution of the orbital angular momentum (OAM) carrying beams propagating in engineered, all-dielectric nano-colloidal suspensions with negative polarizability and saturable nonlinearity. Due to the high power of the incident beam, the modulation instability leads to an exponential growth of weak perturbations and thus splits the original OAM beam into a necklace beam consisting of several bright spots. The number of observed bright spots is intrinsically determined by the topological charge of the incident beam and agrees well with the predictions of the linear stability analysis and numerical simulations. In the second part of this talk, we discuss the design and experimental demonstration of a chalcogenide glass based metasurface enabling all-optical switching of a Hermite-Gaussian beam to an OAM beam depending on the intensity of the incoming light beam. Such nonlinear metasurface was designed using the analysis of guided resonances in photonic crystal and fabricated using standard electron beam lithography technique.
12:00 - 12:15 - Losses and Nonlinear Distortion of Wave Packets due to Conductor Surface Roughness Oral [Show abstract]
  • Alex Schuchinsky, University of Liverpool, UK
Surface roughness and texture of printed conductors increase dissipative losses and enhance the effect of electro-thermal nonlinearity. Although this nonlinearity is weak it can significantly distort the wave packets and modulated signals. In this work, the effects of conductor losses on integrity of multifrequency wave packets is explored and elucidated.
12:15 - 12:30 - Nonlinear Quasi-Phase Matching with metasurfaces Oral [Show abstract]
  • Sébastien Héron, CNRS - CRHEA, France
  • Bernhard Reineke, University of Paderborn, Germany
  • Stéphane Vézian, CNRS - CRHEA, France
  • Thomas Zentgraf, University of Paderborn, Germany
  • Benjamin Damilano, CNRS - CRHEA, France
  • Patrice Genevet, CNRS - CRHEA, France
Quasi-Phase Matching is an optical process needed to build up nonlinear signal from strong pump intensity and is generally obtained through periodical inversion of coherence domains of the crystal. We show that this effect can be artificially monitored through inserting metasurfaces along the optical path of the light in a waveguide allowing continuous increase of the nonlinear signal.
10:30 - Nanoparticles and nanoantennas

Session chairperson(s): Carlo Forestiere; Francisco Rodríguez-Fortuño

10:30 - 10:45 - On the Nanoparticle Resonances in the Full-Retarded Regime Oral [Show abstract]
  • Carlo Forestiere, University of Naples Federico II, Italy
  • Giovanni Miano, University of Naples Federico II, Italy
  • Mariano Pascale, University of Naples Federico II, Ital
  • Roberto Tricarico, University of Naples Federico II, Italy
A spectral technique is applied to evaluate the resonance frequencies of the full retarded scattering from spherical nanoparticles. This approach allows one to identify the modes that are responsible of both the peaks and the asymmetric lineshapes of the scattered power spectra. The resonances properties of dielectric and metal spheres are discussed.
10:45 - 11:00 - Design of Particles Permittivity for Electromagnetic Scattering through Material Independent Modes Oral [Show abstract]
  • Carlo Forestiere, University of Naples Federico II, Italy
  • Giovanni Miano, University of Naples Federico II, Italy
  • Mariano Pascale, University of Naples Federico II, Italy
  • Roberto Tricarico, University of Naples Federico II,
We represent the electromagnetic field scattered by an homogeneous object in terms of a set of modes independent of its permittivity. In this basis the expansion coefficients of the scattered field are a rational function of the permittivity of the scatterer. We show how, exploiting this very simple functional dependence, we are able to greatly simplify the design of the permittivity of an object to pursue a prescribed tailoring of the scattered field.
11:00 - 11:15 - Resonances in Impedance-Boundary Scatterers Oral [Show abstract]
  • Ari Sihvola, Aalto University, Finland
  • Dimitrios Tzarouchis, Aalto University, Finland
  • Pasi Ylä-Oijala, Aalto University, Finland
  • Henrik Wallén, Aalto University, Finland
  • Beibei Kong, Aalto University, Finland
This presentation focuses on the electromagnetic scattering characteristics of spheres with surface defined by the impedance boundary condition. The results include resonances that are very strong and sharp for small subwavelength particles, and analogous to the localized surface plasmons.
11:15 - 11:30 - Eccentric Metallo-Dielectric Core-Shell Nanoparticles For Switching And Guiding Purposes Oral [Show abstract]
  • Angela I. Barreda, University of Cantabria, Spain
  • Yael Gutierrez, University of Cantabria, Spain
  • Juan M Sanz , Textil Santanderina, Spain
  • Francisco Gonzalez, University of Cantabria, Spain
  • Fernando Moreno , University of Cantabria, Spain
We demonstrate the possibility of using isolated eccentric metallo-dielectric core-shell nanoparticles for redirecting the incident radiation into some specific directions eventually different from the forward and backward ones. In particular, we show their utility for building operational switching devices.
11:30 - 12:00 - Dual Scatterers: Design and Applications Invited oral [Show abstract]
  • Carsten Rockstuhl, Karlsruhe Institute of Technology, Germany
  • Ivan Fernandez-Corbaton, Karlsruhe Institute of Technology, Germany
  • Aso Rahimzadegan, Karlsruhe Institute of Technology, Germany
  • Florian Graf, Karlsruhe Institute of Technology, Germany
  • Mohamed Ismail Abdelrahman, Karlsruhe Institute of Technology, Germany
Dual scatterers attracted quite a lot of research attention thanks to their ability to preserve the helicity of the incident light and to suppress backscattering. This might find use in the design of, e.g., highly efficient meta-surfaces. However, dual scatterers are frequently discussed while assuming them to be dipolar. Here, we overview our recent efforts to identify dual scatterers that are dual beyond the dipolar assumption.
12:00 - 12:30 - Near-field Directionality Beyond Circularly Polarized Dipoles: the Janus Source Invited oral [Show abstract]
  • Michela F. Picardi, King's College London, United Kingdom
  • Lei Wei, King's College London, United Kingdom
  • Jack J. Kingsley-Smith, King's College London, United Kingdom
  • Anatoly V. Zayats, King's College London, United Kingdom
  • Francisco J. Rodríguez-Fortuño, King's College London, United Kingdom
Near-field directionality of circularly polarized dipoles has opened the way to the design of novel devices such as integrated nano-polarimeters, polarization-based nano-routers, and non-reciprocal optical devices. Here we extend the directionality of dipolar near-fields, uncovering novel directional sources beyond the circularly polarized emitter. These sources exhibit distinct symmetries and behaviors.
10:30 - Design and modeling

Session chairperson(s): Baile Zhang; Wenjie Chen

10:30 - 11:00 - Surface-Wave Photonic Crystals Invited oral [Show abstract]
  • Baile Zhang, Nanyang Technological University, Singapore
Photonic crystals generally lack subwavelength features, while surface plasmons or spoof surface plasmons possess spatial scales typically much smaller than the wavelength. Here we show that many device concepts in photonic crystals can be transferred and applied directly to the manipulation of surface waves at the subwavelength scale.
11:00 - 11:30 - Metamaterials with Index Ellipsoids at Arbitrary k-points Invited oral [Show abstract]
  • Wenjie Chen, Hong Kong University of Science and Technology, China
  • Bo Hou, Soochow University, China
  • Zhao-Qing Zhang, Hong Kong University of Science and Technology, China
  • John B. Pendry, Imperial College, U. K.
  • C. T. Chan, Hong Kong University of Science and Technology, China
Ordinary materials have their index ellipsoids centered at k = 0. We propose a new type of metamaterial possessing multiple index ellipsoids centered at arbitrary nonzero k-points. Their locations in momentum space are determined by the connectivity of a set of interpenetrating metallic scaffolds. Such system is a new class of metamaterial whose properties arise from global connectivity and hence can have broadband functionality in applications such as negative refraction, orientation-dependent coupling effect and cavity without walls; and they are fundamentally different from ordinary resonant metamaterials which are inherently bandwidth limited. We performed microwave experiments to confirm our findings.
11:30 - 11:45 - A Complete Circuit Model for Two Coils inside a Dissipative Medium Oral [Show abstract]
  • Son Chu, University of Oxford, United Kingdom
  • Christopher J. Stevens, University of Oxford, United Kingdom
  • Ekaterina Shamonina, University of Oxford, United Kingdom
Mutually coupled inductors are a vital part of many metamaterials system as well as near field communication and wireless power transfer technologies. A conducting, dissipative medium in proximity to two inductors can have a significant impact on their near fields and hence their mutual coupling. Eddy currents in the medium are responsible for the change in mutual and self-inductance. In this paper, we develop a complete circuit model of two coils inside a conductive environment, where the lossy Kirchhoff’s coefficients due to the eddy currents are derived from the field solutions.
11:45 - 12:00 - Interplay between Chirality and Magnetism in Microwave Metamaterials Oral [Show abstract]
  • Satoshi Tomita, Nara Institute of Science and Technology, Japan
  • Hiroyuki Kurosawa, National Institute of Information and Communications Technology, Japan
  • Kei Sawada, RIKEN SPring-8 Center, Japan
  • Tetsuya Ueda, Kyoto Institute of Technology, Japan
This paper introduces interplay between chirality and magnetism in microwave metamaterials with simultaneous space-inversion and time-reversal and symmetry breaking. Experimental and numerical studies show the emergence of enhanced and giant magnetochiral effects by combining chiral and magnetic resonances in the metamolecule. This work paves a way toward the realization of a one-way mirror and synthetic gauge fields for electromagnetic waves.
12:00 - 12:15 - Optimization of Meta-atoms for 3D Printed Metamaterial Structures Oral [Show abstract]
  • Andrea Vallecchi, University of Oxford, United Kingdom
  • Son Chu, University of Oxford, United Kingdom
  • Ekaterina Shamonina, University of Oxford, United Kingdom
  • Christopher J. Stevens, University of Oxford, United Kingdom
Additive manufacturing by fused deposition modelling (FDM) now offers some useful performance for functional materials including conductors. Whilst this technology enables the creation of truly three-dimensional (3D) composite structures its accuracy and resolution are not yet so refined as those of 2D fabrication methods. Moreover, dielectric and metallic filaments used in FDM have complex material properties that depend on print parameters and usually exhibit higher losses than RF substrates and bulk conductors. In this work we investigate by simulations and experiments several magnetic meta-atom variants with a view to developing optimal designs for the successful production of metamaterials at microwaves with FDM techniques. Conductor thickness is shown to be a useful new design parameter to reach the desired degree of miniaturization and resonance quality factor of the meta-atoms at low print resolution.
12:15 - 12:30 - Optically Transparent Metasurfaces for Controlling Microwave Scattering and Absorption Oral [Show abstract]
  • Ke Chen, Nanjing University, China
  • Tianshu Li, Nanjing University, China
  • Yijun Feng, Nanjing University, China
Conventional microwave metasurfaces are usually composed of copper/dielectric inclusions which are opaque in visible frequencies. Here, metasurfaces with optical transparency is proposed to control either the backward scattering or the absorption in microwave region. We have designed a flexible coding metasurface for reducing the backward scattering with at least 10 dB from 7.8 to 15 GHz. By using lossy optically transparent film, we have also optimized a broadband microwave absorber with subwavelength thickness. These proposals offer new opportunities for manipulating the microwave scattering and absorption with simultaneously high optical transparency, which may provide benefits in real-world uses, for example, window and solar panel applications.
12:30 - 14:00 - Lunch break (Wednesday)
14:00 - 15:30 - Oral sessions (Wednesday - afternoon 1)
14:00 - Topological effects I

Session chairperson(s): Gennady Shvets; Dimitrios Sounas

14:00 - 14:30 - Chern Topological Index as a “Quantum” of the Fluctuation-Induced Light-Angular Momentum Invited oral [Show abstract]
  • Mario Silveirinha, University of Lisbon, Portugal
Topological phases of nonreciprocal photonic platforms are usually characterized by the Chern number. Different from condensed-matter systems, so far no physical meaning has been attributed to the photonic Chern number. Here, it is shown that the photonic Chern number is the quantum of the thermal or quantum fluctuation-induced light-angular momentum in a closed photonic insulator cavity.
14:30 - 14:45 - Exploration Of Edge Modes Formed In Periodic Hexagonal Metasurfaces With Glide Symmetry Oral [Show abstract]
  • Julia D. de Pineda, University of Exeter, United Kingdom
  • Gareth P. Ward, University of Exeter, United Kingdom
  • Alastair P. Hibbins, University of Exeter, United Kingdom
  • J. Roy Sambles, University of Exeter, United Kingdom
We study the edge modes supported by a bilayer metasurface formed by two arrays of circular metallic patches with a finite width. The circular patches are arrangend in an identical hexagonal array in each layer. It was found that depending on the way the second layer is placed with respect to the first one, there exists an edge mode at frequencies that lie inside the stopband of the structure.
14:45 - 15:00 - Active Topological Plasmons in Graphene: The Meta-Gate Approach Oral [Show abstract]
  • Minwoo Jung, Cornell University, USA
  • Zhiyuan Fan , Cornell University, USA
  • Gennady Shvets, Cornell University, USA
A valley plasmonic crystal for graphene surface plasmons (GSPs) will be described. It will be shown that a designer metagate, placed within a few nanometers from graphene, can be used to impose a triangular periodic Fermi energy landscape on the latter. For specific metagate geometries and bias voltages, the combined metagate-graphene structure is shown to produce sufficiently strong Bragg scattering of GSPs to produce complete propagation bandgaps, and to impart the GSPs with nontrivial valley-linked topological properties. Valley-selective kink states supported by a domain wall between differently patterned metagates are shown to propagate without reflections along sharply curved interfaces owing to suppressed inter-valley scattering. Our approach paves the way for non-magnetic dynamically reconfigurable topological nanophotonic devices.
15:00 - 15:15 - Piezoelectric Topological Insulators for Acoustic Waves Oral [Show abstract]
  • Dimitrios Sounas, The University of Texas at Austin, USA
  • Andrea Alu, City University of New York, USA
We present topological insulators for surface acoustic waves on piezoelectric materials. Our structures are based on honeycomb lattices of different types of acoustic domains and derive their nontrivial topology by breaking the symmetry of the lattice hexagonal unit cells. Our results can have applications in compact signal processing integrated devices at microwave frequencies based on surface acoustic waves.
15:15 - 15:30 - Experimental Demonstration of an Acoustic Anomalous Floquet Topological Insulator in Waveguide Network Oral [Show abstract]
  • Qi Wei, Nanjing Normal University, China
  • Da-Jian Wu, Nanjing Normal University, China
  • Ying Cheng, Nanjing University, China
  • Zheng Xu, Tongji University, China
  • Xiao-Jun Liu, Nanjing University, China
We experimentally demonstrate an acoustic anomalous Floquet topological insulator in a waveguide network. The gapless edge states can be found in the band gap when the waveguides are strongly coupled. The scheme features simple structure and high-energy throughput, leading to efficient and robust topologically protected sound propagation along the boundary.
14:00 - Design of mechanical metamaterials

Session chairperson(s): Giorgio Carta; Martin Wegener

14:00 - 14:30 - Recent Progress on 3D Mechanical Metamaterials Invited oral [Show abstract]
  • Jingyuan Qu, Karlsruhe Institute of Technology, Germany
  • Tobias Frenzel, Karlsruhe Institute of Technology, Germany
  • Muamer Kadic, Karlsruhe Institute of Technology, Germany
  • Martin Wegener, Karlsruhe Institute of Technology, Germany
We present our recent theoretical and experimental progress on microstructured 3D mechanical metamaterials. This includes drastically simplified architectures leading to a negative effective volume compressibility and mechanical activity in 3D chiral micropolar metamaterials.
14:30 - 14:45 - Physical Model of a Chiral Flexural Waveguide Oral [Show abstract]
  • Giorgio Carta, Liverpool John Moores University, United Kingdom
  • Michael Nieves, Keele University, United Kingdom
  • Ian Jones, Liverpool John Moores University, United Kingdom
  • Natasha Movchan, University of Liverpool, United Kingdom
  • Alexander Movchan, University of Liverpool, United Kingdom
We present a novel physical model of a gyrobeam, a chiral structural element where flexural and rotational motions are coupled. In the literature, the gyrobeam is described as a mathematical object possessing a continuous distribution of stored angular momentum. In this paper, we show that gyrobeams can be realised by connecting gyroscopes to Euler-Bernoulli beams; in addition, we provide a physical interpretation of the gyricity parameter of a gyrobeam.
14:45 - 15:00 - Manipulation of Vector Elastic Solitons by Flexible Mechanical Metamaterials Oral [Show abstract]
  • Bolei Deng, Harvard University, USA
  • Pai Wang, Harvard University, USA
  • Qi He, Tsinghua University, China
  • Vincent Tourinat, Le Mans Université, France
  • Katia Bertoldi, Harvard University, USA
We report the design and analysis of nonlinear mechanical metamaterials whose structure and properties can be controlled in multiple ways, and which support the propagation of nonlinear elastic waves. We particularly focus on auxetic rotating squares structures, made of rigid masses connected by flexible elastic hinges, the latter playing the roles of longitudinal, shear and bending springs. Through theoretical and numerical modeling as well as experiments, we study the propagation of vector elastic solitons in a quasi one-dimensional configuration, and show that the actual nonlinearity of the system can be controlled. The interactions of vector elastic solitons with controlled defects is analyzed and reveal means of manipulating their reflexion and transmission properties, which are found dependent on their amplitude, i.e. nonlinear. Possible use of the observed effects will be discussed.
15:00 - 15:15 - Non-reciprocity in Mechanical Metamaterials Oral [Show abstract]
  • Corentin Coulais, University of Amsterdam, Netherlands
We introduce mechanical metamaterials with suitably designed architectures and active-feedback that exhibit non-reciprocity, namely they transmit motion differently depending on the direction of the input forcing.
Media link(s):

A video preview can be watched here.

15:15 - 15:30 - Non-commuting metamaterials: a new paradigm towards reprogrammability? Oral [Show abstract]
  • Matthieu Labousse, Laboratoire Gulliver, ESPCI Paris, CNRS & PSL University, France
  • Martin van Hecke, AMOLF & Leiden University, The Netherlands
The development of mechanical metamaterials rapidly grows and explores multiple strategies to design functional materials. Essentially a function relies on a internal structural property, so that a radical change of function often requires redesigning a new structure from scratch. Pre-encoding several functions in one single structure is a corner stone towards designing truly reprogrammable mechanical metamaterials. In this talk I will discuss a new strategy we have investigated. We construct a metamaterial by assembling non-commuting unit cells. Each unit can be actuated by two external inputs, say A and B such that actuating A then B is different than B then A. We propose a rationale design to encode this non-commuting property. Finally by assembling multiple unit cells we obtain what we call a noncommuting material and I will present some of its emerging properties.
14:00 - Special session: VISORSURF project

Organizer(s): Sergei Tretyakov; Maria Kafesaki

Session chairperson(s): Maria Kafesaki; Sergei Tretyakov

14:00 - 14:30 - Software-Defined Metasurface Paradigm: Concept, Challenges, Prospects Invited oral [Show abstract]
  • Alexandros Pitilakis, Foundation for Research and Technology Hellas, Greece
  • Anna C. Tasolamprou, Foundation for Research and Technology Hellas, Greece
  • Christos Liaskos, Foundation for Research and Technology Hellas, Greece
  • Fu Liu, Aalto University, Finland
  • Odysseas Tsilipakos, Foundation for Research and Technology Hellas, Greece
  • Xuchen Wang, Aalto University, Finland
  • Mohammad Sajjad Mirmoosa, Aalto University, Finland
  • Kypros Kossifos, University of Cyprus, Cyprus
  • Julius Georgiou, University of Cyprus, Cyprus
  • Andreas Pitsilides, University of Cyprus, Cyprus
  • Nikolaos V. Kantartzis, Foundation for Research and Technology Hellas, Greece
  • Sotiris Ioannidis, Foundation for Research and Technology Hellas, Greece
  • Eleftherios N. Economou, Foundation for Research and Technology Hellas, Greece
  • Maria Kafesaki, Foundation for Research and Technology Hellas, Greece
  • Sergei A. Tretyakov, Aalto University, Finland
  • Costas M. Soukoulis, Foundation for Research and Technology Hellas, Greece
HyperSurfaces (HSFs) are thin layered metamaterials whose electromagnetic behavior is defined programmatically. HSFs merge metasurfaces with networks of miniaturized electronic controllers in an integrated scalable hardware platform, so that programmatic commands expressing the desired end-functionality effectively reconfigure the metasurface. We present the HSF paradigm and highlight its challenges and prospects.
14:30 - 15:00 - Electromagnetic Aspects of Practical Approaches to Realization of Intelligent Metasurfaces Invited oral [Show abstract]
  • Fu Liu, Aalto University, Finland
  • Odysseas Tsilipakos, Foundation for Research and Technology Hellas, Greece
  • Xuchen Wang, Aalto University, Finland
  • Alexandros Pitilakis, Foundation for Research and Technology Hellas, Greece
  • Anna Tasolamprou, Foundation for Research and Technology Hellas, Greece
  • Mohammad Mirmoosa, Aalto University, Finland
  • Do-Hoon Kwon, University of Massachusetts Amherst, USA
  • Kypros Kossifos, University of Cyprus, Cyprus
  • Julio Georgiou, University of Cyprus, Cyprus
  • Maria Kafesaki, Foundation for Research and Technology Hellas, Greece
  • Costas Soukoulis, Foundation for Research and Technology Hellas, Greece
  • Sergei Tretyakov, Aalto University, Finland
We thoroughly investigate the electromagnetic response of intelligent metasurfaces. We study two distinct designs, a switch-fabric-based design for GHz frequencies and a graphene-based approach for THz band, and discuss the respective practical design considerations. The performance for tunable perfect absorption applications is assessed in both cases.
15:00 - 15:30 - Information Metamaterials: Real-Time Information Processing Systems Invited oral [Show abstract]
  • Tie Jun Cui, Southeast University, China
The concept of coding metamaterials or metasurfaces has been proposed, in which metamaterials are characterized by 1-bit digital coding particles of ‘0’ and ‘1’ with 180° phase difference, or 2-bit digital coding particles of ‘00’, ‘01’, ‘10’, and ‘11’ with 90° phase difference, etc. It was demonstrated that the electromagnetic waves can be manipulated by changing the digital coding sequences.
14:00 - Active/non-Hermitian systems II

Session chairperson(s): Mercedeh Khajavikhan; Filippo Capolino

14:00 - 14:15 - Towards Experimental Implementation And The Effects Of Finite-Aperture Size In Dark State Metasurface Lasers Oral [Show abstract]
  • Sotiris Droulias, Foundation for Research and Technology Hellas, Greece
  • Thomas Koschny, Ames Laboratory and Iowa State University, USA
  • Costas M. Soukoulis, Foundation for Research and Technology Hellas, Ames Laboratory and Iowa State University, Greece & USA
We propose a metamaterial laser system, which allows to separate the implementation of the resonant lasing state from radiative out-coupling. We examine the proposed laser concept in implementations that represent realistic experiments and we establish conditions for the required minimum system and aperture size.
14:15 - 14:30 - Graphene-Based Hyperbolic Metamaterials with Non-Local Quantum Gain Oral [Show abstract]
  • Illya Tarasenko, Imperial College London, United Kingdom
  • Freddie Page, Imperial College London, United Kingdom
  • Ortwin Hess, Imperial College London, United Kingdom
We propose stratified graphene-dielectric structures as a route to active hyperbolic metamaterials. Employing an exact in RPA, non-local quantum conductivity model allows us to describe the graphene plasmons in the photo-inverted graphene carrier system at large wavevectors, which is of key interest for hyperbolic metamaterials. By calculating Bloch modes of these structures, we predict the possibility of mode loss compensation and amplification, as well as show the tunability of these properties.
14:30 - 15:00 - Enhanced Sensitivity at Non-Hermitian Exceptional Points No show [Show abstract]
  • Mercedeh Khajavikhan, University of Central Florida, USA
  • Demetrios Christodoulides, University of Central Florida, USA
  • Hossein Hodaei, University of Central Florida, USA
Enhanced sensitivity is demonstrated in PT-symmetric coupled micro-resonator arrangements biased at an exceptional point. The spectral response of such a system is shown to follow a nth root dependence on externally introduced perturbations.
15:00 - 15:30 - General Conditions to Realize Exceptional Points of Degeneracy and Applications Invited oral [Show abstract]
  • Mohamed Nada, University of California, Irvine, USA
  • Tarek Mealy, University of California, Irvine, USA
  • Farshad Yazdi, University of California, Irvine, USA
  • Ahmed Abdelshafy, University of California, Irvine, USA
  • Alexander Figotin, University of California, Irvine, USA
  • Filippo Capolino, University of California, Irvine, USA
We explore the emergence of exceptional points of degeneracy (EPDs) that denote a coalescence of multiple eigenmodes in coupled-mode structures. We establish the general conditions that lead to observing EPDs of different orders in various coupled systems, either uniform (non-periodic) or periodic. EPDs can be found in lossless systems as well as in systems with gain-loss balance. Also, we provide examples of potential applications of structures with EPDs that help improve the performance of devices, like sensors, oscillators, etc., at microwave and optical frequencies.
15:30 - 17:30 - Coffee break and Poster session (Wednesday afternoon)
15:30 - Poster session

Session chairperson(s): Igor Nefedov; Tommaso Isernia

1 - Recent Developments In The Design Of Waveform-Selective Mantle Cloaks For Antenna Applications Poster [Show abstract]
  • Stefano Vellucci, "Roma Tre" University, Italy
  • Alessio Monti, Niccolò Cusano University, Italy
  • Mirko Barbuto, Niccolò Cusano University, Italy
  • Alessandro Toscano, "Roma Tre" University, Italy
  • Filiberto Bilotti, "Roma Tre" University, Italy
In this contribution, we investigate the idea of a waveform selective cloak for antenna applications. To achieve this purpose, a conventional mantle cloak designed to hide a wire antenna is loaded with a lumped-element circuit. Exploiting the peculiar time-domain response of the circuit, the cloak is able to modify its behavior either as an invisibility device or a perfect electric conductor when the impinging signal switches from a pulse (PW) to a continuous (CW) wave, respectively. The proposed configuration paves the way to a new generation of tunable and reconfigurable cloaking devices for antenna applications.
2 - Optimized Metamaterial Loaded Square Fractal Antenna for Gain and Bandwidth Enhancement Poster [Show abstract]
  • Suganthi Sellakkutti, CHRIST (Deemed to be University), India
Abstract – This paper presents a report on the enhanced performance of an optimized metamaterial loaded square fractal antenna (OMSFA). The design and simulation of the antenna was carried out using Electronic Desk Top HFSS version 18.2 software. The antenna layer spreads over an area of 23 square millimeter on a FR4 substrate whose dielectric permittivity is 4.4. The substrate size measures an area of 28 mm X 46 mm, with 1.6 mm thickness. Also The design includes a microstrip feed and truncated ground. The antenna resonates well with a deep return loss of -38.9 dB in a broad frequency range of 3.15 GHz between 2GHz and 5.2 GHz. The OMSFA produces enhanced gain of 9.8 dB at 2.5 GHz. The radiation is more focused due to the effect of metamaterial loading. The proposed antenna is recommended for wireless application in the lower region (S band) of the microwave spectrum.
3 - Planar Directivity of a Dipole Array Poster [Show abstract]
  • Jiaruo Yan, University of Oxford, United Kingdom
  • Ekaterina Shamonina, University of Oxford, United Kingdom
  • Christopher Stevens, University of Oxford, United Kingdom
We develop a technique for fast evaluation of superdirective performance of coupled meta-atoms. Traditionally, the directivity of an antenna is obtained from 3D measurements of the far-field radiated power over a spherical surface. We propose an alternative method of finding the directivity from a faster 2D scan over a circular path, by introducing the ''planar directivity'' for dipole arrays. We derive analytical expressions for maximum achievable values of directivity and planar directivity, establish the correlation between them, and identify the range of parameters (inter-element distance, coupling constant, quality factor) for which the conversion of planar directivity to directivity for superdirective dimers is possible.
4 - Improvement of Low Profile Dipole Antenna Parameters with EBG-Mushroom Structure in X Band for Microwave Imaging No show [Show abstract]
  • Emin Unal, Iskenderun Technical University, Turkey
  • Fatih Alkurt, Iskenderun Technical University, Turkey
  • Olcay Altintas, Iskenderun Technical University, Turkey
  • Mehmet Bakir, Bozok University, Turkey
  • Muharrem Karaaslan, Iskenderun Technical University, Turkey
<p> This study presents a mushroom shaped electromagnetic band gap (EBG) structure for the antenna parameter enhancement of low profile dipole antenna. X band frequency regime is selected for operation and improvements in antenna parameters are observed, so that is the novelty of this study. Radiation pattern, side lobe level, and gain are improved with EBG-mushroom structure by some experimental studies. In the future works, proposed mushroom shaped ebg structure will be used in microwave imaging applications.</p>
5 - Mutual-Coupling Reduction in Metamaterial SIW Slotted Antenna Arrays Using Metal Fence Isolators for SAR and MIMO Applications Poster [Show abstract]
  • Mohammad Alibakhshikenari, University of Rome "Tor Vergata", Italy
  • Bal S. Virdee, London Metropolitan University, United Kingdom
  • Chan H. See, University of Bolton , United Kingdom
  • Raed Abd-Alhameed, University of Bradford, United Kingdom
  • Marjan Marbouti, University of Helsinki, Finland
  • Francisco Falcone, Universidad Pública de Navarra, Spain
  • Ernesto Limiti, University of Rome "Tor Vergata", Italy
A new type of mutual coupling reduction technique is applied to metamaterial substrate integrated waveguide (SIW) slotted antennas array. The circular shaped reference SIW antenna is constructed from Alumina substrate with dimensions of 40×5×1.5 mm3. Embedded in the reference antenna is an array of 38 slots with dimensions of 2×1×1.5 mm3. The reference SIW antenna covers six frequency bands from X- to Ku-bands with maximum and average isolation between the radiation slots of approximately -20 dB and -10 dB, respectively. Isolation was increased by inserting metal fences between the radiation slots, which also improves the antenna’s impedance matching properties. Maximum, minimum, and average suppression on mutual coupling between radiation slots after application of the metal fences are 20 dB, 8 dB, and 13 dB, respectively. The proposed metal fence isolators (MFI) improve the radiation patterns without degrading the antenna’s performance. With MFI the maximum gain achieved improves by ~10%. The technique is simple to implement and proposed for synthetic aperture radar (SAR) and multiple input multiple output (MIMO) applications.
6 - Practical Isotropy and Anisotropy of 3-D Printed Artificial Foam-Like Dielectrics with Antenna Applications Poster [Show abstract]
  • Plamen Dankov, Sofia University , Bulgaria
  • Valda Levcheva , Sofia University, Bulgaria
  • Mario Iliev, Sofia University, Bulgaria
<p> The models, limitations and realization of artificially-isotropic foam-like 3-D printed dielectrics have been presented applying different fully symmetrical unit cells. The strategy for control of the absolute values of the isotropic equivalent dielectric constant of these artificial dielectrics has been presented and verified and the possible anisotropy has been minimized.</p>
7 - Decoupling of Two Closely Located Dipoles Using Metasurfaces of Resonant Dipoles and Split-Loop Resonators Poster [Show abstract]
  • Masoud Sharifian Mazraeh Mollaei, Aalto University, Finland
  • A. Hurshkainen, ITMO University, Russia
  • S. Kurdjumov, ITMO University, Russia
  • S. Glybovski, ITMO University, Russia
  • C. Simovski, Aalto University, Finland
We present numerical and experimental validations of decoupling between two very closely located dipole antennas using metasurfaces. Compared to decoupling by a single passive scatterer, decoupling by metasurfaces reduces negative effects over the radiated signal. Simulation and measurement results demonstrate the possibility of decoupling between two active dipoles using metasurfaces of passive dipoles and split-loop resonators (SLRs).
8 - Effective Source of Runaway Electrons for Low-Dose Industrial Radiography No show [Show abstract]
  • Vasily Kozhevnikov, Institute of High Current Electronics, Russia
  • Andrey Kozyrev, Institute of High Current Electronics, Russia
  • Natalia Semeniuk, Institute of High Current Electronics, Russia
  • Aleksandr Kokovin, Tomsk State University, Russia
  • Viktoriia Goliak, Tomsk State University, Russia
In this paper we numerically investigate nonstationary nanosecond gas discharge in the two-dimensional semi-periodic computational geometry of the gas diode with a plane-grid cathode system. Previously this configuration was studied experimentally as a source of intensive runaway electron beam. It can be used as an effective source of ultrashort powerful X-ray radiation in a wide range of industrial applications, e.g. in the fields of low-dose radiography. Our computations provide detailed simulation of the electric discharge with an estimation of the most important characteristics of output runaway electrons.
9 - Compact Broadband Dipole Antenna with Split Ring Resonators Poster [Show abstract]
  • Ikmo Park, Ajou University, Korea (South)
  • Kam Eucharist Kedze, Ajou University, South Korea
  • Heesu Wang, Ajou University, South Korea
A compact broadband low-profile dipole antenna with split ring resonators (SRRs) is presented. The antenna is composed of a conventional dipole element and two SRRs. Each arm of the printed dipole is enclosed by a printed SRR to provide the favorable electromagnetic environment for coupling. Three modes are generated, which interact together to provide broadband characteristics, covering 1.45 GHz to 2.49 GHz (|S11| < −10 dB bandwidth of 52.79%). The antenna is computationally demonstrated to have broadband characteristics and stable gain with symmetric radiation patterns. The compact antenna with overall dimensions of 74.6 mm x 10.2 mm x 0.508 mm (0.489λo x 0.067λo x 0.0033λo at 1.97 GHz) has a radiation efficiency > 90%. The compact size, simple structure, and stable radiation properties of the antenna increase its suitability for many wireless communication applications.
10 - Two Elements MIMO Antenna with Asymmetric Coplanar Strip Metamaterial Configuration and EBG Hybrid Isolation Poster [Show abstract]
  • Mahmoud Abdalla, Military Technical College, Egypt
  • Donya Nazif, October University for Modern Sciences and Arts, Egypt
  • Aya Ali, October University for Modern Sciences and Arts, Egypt
<p> This paper introduces a compact asymmetric coplanar strip (ACS)-fed composite right/left handed (CRLH) multiple input multiple output (MIMO) antenna with 20 dB isolation for multiband operation. The ACS-fed MIMO antenna is designed of two elements, operating at 4.6 GHz, 4.9 GHz and 5.4 GHz with good reflection coefficient (less than -20 dB) matching properties. By using mushroom like electromagnetic bandgap structure, further mutual coupling reduction better than 30 dB is achieved. The overall MIMO antenna size is compact (46.5 × 26 mm2). The MIMO antenna has less than 0.02 ECC and maximum than 9.98 dB diversity gain. The obtained results are simulated using full wave simulations.</p>
11 - A Compact Band Stop Filter with Sharp StopBand Response using D-CRLH Configuration Poster [Show abstract]
  • Mahmoud Abdalla, Military Technical College, Egypt
  • Yasmine Hammad, October University for Modern Sciences and Arts, Egypt
  • Ahmed Daw, October University for Modern Sciences and Arts, Egypt
<p> In this paper a sharp compact stopband filter is introduced based on unbalanced dual composite right left handed D-CRLH unit cell. The stopband overlaps with the undesired frequencies in the antenna functionalities. The filter works for applications in C-band, where the allocation receiving frequency of the standard C-band. The cutoff frequencies of the proposed filter are 3 GHz and 5 GHz. Moreover, the proposed filter has a very sharp stopband response. The filter size is only 0.329 λg × 0.609λg where λg is the guided wavelength at 4 GHz.</p>
12 - Engineering of Metamaterials Based Cut-band to Bandpass Filters Poster [Show abstract]
  • Frederique Gadot, Universite Paris Nanterre, France
  • Benoit Belier, Universite Paris Saclay, France
  • Michel Piat, Universite Paris Diderot, France
  • Faouzi Boussaha, Observatoire de Paris, France
<p> Metamaterial based filters are often made by placing Split Ring Resonator (SRR) along a microstrip line. Due to the behavior of resonators, the obtained rejection gets a high quality factor. A new design with progressively various size of SRR is proposed to obtain bandpass filter.</p>
13 - A Linear-To-Circular Polarization Converter With Broadband Transparency Based On Huygens’ Metasurface Poster [Show abstract]
  • Andrey Sayanskiy, ITMO University, Russia
  • Stanislav Glybovski, ITMO University, Russia
  • Juan Domingo Baena, Universidad Nacional de Colombia, Colombia
<p> In this work we present the results of numerical simulation and experimental investigation of the Huygens’ metasurface providing linear-to-circular polarization conversion. We show, that under certain condition the metasurfaces can operate as linear-to-circular polarizer in two frequency bands having at the same time broadband transparency.</p>
14 - Contact-less Measurement by Using Glide-symmetric Holes on Flanges Poster [Show abstract]
  • Mahsa Ebrahimpouri, KTH Royal Institute of Technology, Sweden
  • Oscar Quevedo-Teruel, KTH Royal Institute of Technology, Sweden
We present a cost-effective solution for contact-less measurement of waveguiding structures at high frequencies. Drilling glide-symmetric holey EBG (electromagnetic band gap) on the flanges, the leakage caused by undesired air-gaps, by the result of human mistakes or instrumental errors, between the flanges can be minimized considerably and contact-less measurement becomes possible.
15 - Chiral Metamaterial Based Microfluidic Sensor Poster [Show abstract]
  • Mehmet Bakir, Bozok University, Turkey
  • Muharrem Karaaslan, İskenderun Technical University, Turkey
  • Faruk Karadag, Çukurova University, Turkey
  • Şekip Dalgac, İskenderun Technical University, Turkey
  • Fatih Özkan Alkurt, İskenderun Technical University, Turkey
  • Mehmet Bagmanci, İskenderun Technical University, Turkey
  • Olcay Altintas, İskenderun Technical University, Turkey
<p> This manuscript focus on developing of new metamaterials sensor based on distinction of different material and purity ratio sample. Unique side of this study is having very clear and sensitive results and presenting new approach to the microfluidic sensor applications by using sample holder. The procedure of this study consist of three steps, measurement of dielectric constant by using Agilent 85070E dielectric measurement kit, developed of proper structure and simulation result, taking experimental output by using sensor layer.</p>
16 - Metamaterial-based Sensor for Measurements of physical Quantities and Parameters of technological Processes Poster [Show abstract]
  • Andrey Yelizarov, Moscow Institute of Electronics and Mathematics, NRU Higher School of Economics, Russia
  • Alexander Kukharenko, ARM Expertise Dept. JSC «Sberbank-Service», Russia
  • Andrey Skuridin, Moscow Institute of Electronics and Mathematics, NRU Higher School of Economics, Russia
Metamaterials are becoming an increasingly important part of microwave technology. Metamaterials are artificial periodic structures with exotic properties which cannot be found in Nature. One of the many possible applications of the metamaterials is microwave measurement. In this paper, a sensor based on planar mushroom-shaped metamaterial is proposed as well as its S21 parameter which depends on certain measured characteristics of a investigated object.
17 - Superdirective Radiation of Helical Trimers No show [Show abstract]
  • Pavel Petrov, University of Exeter, United Kingdom
  • Gareth Ward, University of Exeter, United Kingdom
  • Roy Sambles, University of Exeter, United Kingdom
  • Alastair Hibbins, University of Exeter, United Kingdom
<p> Abstract – We propose a magnetically coupled trimer of subwavelength helices that demonstrates superdirective end-fire radiation in the MHz to low GHz frequency range. Our modelling suggests that it provides directivity that is almost double that previously achieved using dimers of split-ring-resonators.</p>
18 - High-Performance and Label-Free THz Biosensing from Metamaterial Poster [Show abstract]
  • Biao-Bing Jin, Nanjing University, China
  • C.H. Zhang, Nanjing University, China
  • J.B. Wu, Nanjing University, China
  • J. Chen, Nanjing University, China
  • P.H. Wu, Nanjing University, China
<p> Label-free, real-time and ultrasensitive biosensors are highly desirable by scientists and biotechnologists. In this talk, we proposed two designs based on the THz metamaterials. The first one consists of a planar array of five concentric subwavelength gold ring resonators on a 10μm-thick polyimide substrate. The second one is a theoretical design to employ PT-symmetry to enhance sensitivity</p>
19 - Phase Advance in a Textile Metamaterial Operating in Sub-Millimeter Band Poster [Show abstract]
  • Ludovic Burgnies, Institute of Electronics, Microelectronics and Nanotechnology, France
  • Camille Huppé, Génie et Matériaux Textiles Laboratory, France
  • Guillaume Ducournau, Institute of Electronics, Microelectronics and Nanotechnology, France
  • Cédric Cochrane, Génie et Matériaux Textiles Laboratory, France
  • François Rault, Génie et Matériaux Textiles Laboratory, France
  • Vladan Koncar, Génie et Matériaux Textiles Laboratory, France
  • Eric Lheurette, Institute of Electronics, Microelectronics and Nanotechnology, France
A textile metamaterial made of woven metallic yarns is designed, produced and analyzed in this work. Preliminary simulations were performed to design a metamaterial producing a phase-advance in the sub-millimeter wave band. Then the textile metamaterial was manufactured by a semi-industrial weaving loom, and its electromagnetic responses were measured in free space. The experimental results are in good agreement with simulation. Moreover, the homogeneity of the textile metamaterial is analyzed by means of two statistical studies carried out on the measured periodicity and on the experimental responses of the sample.
20 - Diffuse THz Scattering via Coding Metasurfaces Poster [Show abstract]
  • Can Koral, University of Naples "Federico II", Italy
  • Gianpaolo Papari, University of Naples "Federico II", Italy
  • Antonello Andreone, University of Naples "Federico II", Italy
  • Massimo Moccia, University of Sannio, Italy
  • Giuseppe Castaldi, University of Sannio, Italy
  • Vincenzo Galdi, University of Sannio, Italy
  • Shuo Liu, Southeast University, China
  • Rui Yuan Wu, Southeast University, China
  • Tie Jun Cui, Southeast University, China
The Terahertz region covers the electromagnetic spectrum incorporating the advantages of both microwaves and infrared light waves. Many different techniques have been proposed to manipulate THz waves. Among them, metamaterials and metasurfaces have proven to have a high potential to engineer new type of functional THz devices. A recent and promising approach is based on coding metasurfaces, consisting of two or more basic (“digital”) unit cells with out-of-phase response, which can be used to achieve diffuse scattering. Here, with special focus on the scattering-signature reduction, the physical mechanism is elucidated via a theoretical study and the relevant scaling-laws validated using THz Time Domain Spectroscopy.
21 - Numerical Study of Fabry-Pérot Resonance Based Metamaterials for Subwavelength Imaging Poster [Show abstract]
  • Md Anazan-uz-Zaman, Korea Institute of Machinery and Materials, University of Science and Technology, the Republic of Korea
  • Shin Hur, Korea Institute of Machinery and Materials, University of Science and Technology, the Republic of Korea
<p> Subwavelength imaging has potential application in higher frequency regime. So, we wanted to achieve highest possible imaging frequency by manipulating the different parameters of Fabry-Pérot(FP) Lens. Here, we have numerically studied the superlens for subwavelength imaging with respect to thickness, hole area and periodicity. Finally, we provide the outline to get the ceiling for the highest frequency of the imaging.</p>
22 - Light Manipulation at Compact Scale via all-Dielectric Metasurfaces Poster [Show abstract]
  • Muhammad Qasim Mehmood, Information Technology University of the Punjab, Lahore, Pakistan, Pakistan
This paper presents the numerical study of efficient and long-propagating optical vortex in the visible domain. The proposed phase gradient metasurface consists of cylindrical nano-pillars, of low-loss dielectric material, which paves a way for numerous highly efficient metasurfaces-based applications.
23 - Anti-Reflective Metasurface Coatings for Mid-Infrared Range No show [Show abstract]
  • Zhanna Dombrovskaya, Lomonosov Moscow State University, Russia
  • Alexander Bogolyubov, Lomonosov Moscow State University, Russia
<p> We consider the optimization of metasurface composed of PbTe spherical particles located on Ge substrate. Mathematical statement of the problem of one-wavelength antireflective coating is formulated. The constrains on its geometric parameters are found. We show that such structure can be both a narrow and a wide-range filters.</p>
24 - Dielectric Color Metasurface Based On Regular Hole Arrays No show [Show abstract]
  • Mehdi Keshavarz Hedayati, Technical University of Denmark, Denmark
  • Søren Raza, Technical University of Denmark, Denmark
  • Anders Kristensen, Technical University of Denmark, Optofluidics, Denmark
<p> The vivid colors of certain animals have attracted the attention of scientists for centuries. Mimicking of colors in animals has inspired scientists to develop metasurfaces to replace pigment and dye based colorants. Most of the research was centered on generation of colors by noble metals such as Au, Al or Ag, based on plasmon resonance absorption in the visible spectrum. Here, we design and fabricate structural color metasurfaces based on regular hole arrays in silicon. All major colors (blue, green and red) are realized. The ease of fabrication and compatibility with complementary metal-oxide semiconductor (CMOS) allows its application in encoding, counterfeit or sub-diffraction printing.</p>
25 - Phase Manipulation of Constant-Intensity Waves in Disordered Optical Structures Poster [Show abstract]
  • Sunkyu Yu, Seoul National University, Korea (South)
  • Xianji Piao, Seoul National University, Korea (South)
  • Choonlae Cho, Seoul National University, Korea (South)
  • Namkyoo Park, Seoul National University, Korea (South)
In this presentation, we investigate the phase control of constant-intensity waves propagating through disordered optical structures. By introducing the separate control of optical phase and amplitude, we show that random phase evolutions obeying the designed restriction can be realized in constant-intensity waves, synthetizing disordered structures composed of non-Hermitian optical potentials.
26 - Remote Modulated Distributed Bragg Reflectors No show [Show abstract]
  • David Margousi, University of Shahre-Rey, Iran
  • Hamed Reza Shoorian, University of Torbat-e-Heydarieh, Iran
  • Zahra Amin, University of Allameh Tabataba’i, Iran
Employing illusion optics theory, a new method is introduced for remote embedding moveable Bragg gratings in an optical waveguide. The special feature of the proposed structure in this work gives it an opportunity to be used as a flexible element in ultrahigh nano-scale integrated photonic circuits for miniaturization and tuning purposes.
27 - The Micron-sized Periodic Structures and Silicon nanocrystals created at the Surface of the Crystal and Amorphous Silica by Resonant CO2 Laser Irradiation No show [Show abstract]
  • Anel Mukhamedgalieva, National Research Technological University MISIS, Russia
  • Igor Shvedov, National Research Technological University MISIS, Russia
  • Vladimir Laptev, Institute of Spectroscopy, Russian Academy of Sciences, Russia
The creation of nanoclasters and micrometre sized periodical structures at the surface of silica (crystal quartz and fused quartz) by action of pulsed CO2 laser radiation (pulse energy of 1 J, pulse time of 70 ns) have been investigated. The appearance of two kind of structures – periodical micron-sized structures with the period length close to wave length of CO2 laser irradiation and silicon nanocrystals with mainly two range of sizes: first - from 2 to 10 nm and second – from 40 to 100 nm have been found.
28 - Optical Force Control Using Phase-Gradient Metasurfaces Poster [Show abstract]
  • Karim Achouri, EPFL, Switzerland
  • Hsiang C. Wang, EPFL, Switzerland
  • Olivier J. F. Martin, EPFL, Switzerland
We propose to control the motion of nanoparticles using phase-gradient metasurfaces. The latter are used to generate surface waves, which put the particles into motion, when illuminated by a normally incident plane wave. We present an initial study of the force and acceleration acting on these particles due to their interactions with the surface wave.
29 - High-Efficiency Thermal Tuning of a Terahertz Metamaterial with Liquid Crystal Poster [Show abstract]
  • Rafał Kowerdziej, Military University of Technology, Poland
  • Marek Olifierczuk, Military University of Technology, Poland
Here we maximize thermally induced tunability of a terahertz metamaterial by using a specially designed nematic liquid crystal mixture. It is shown that the resonant response of a metamaterial device can be effectively tuned both in terms of its magnitude and wavelength with the spectral tunability approaching the theoretical limit of 8 GHz. Electromagnetic simulations confirm our tests and match the experimental observations well. The suggested approach opens new routes for soft-matter-based filtering and sensing devices.
30 - Optical Switching Cell Based On Metamaterials And Ferrite Films Poster [Show abstract]
  • Konstantin Vytovtov, Astrakhan State Technical University, Russia
  • Elizaveta Barabanova, Astrakhan State Technical University, Россия
  • Said Zouhdi, Paris-Sud University, France
A principally new switching cell with four inputs and four outputs based on metamaterial and optically transparent ferrite films for processing a large amount of information is proposed in this work. The cell uses the spatial diversity of the information beams under action of the control magnetic field. The principle of the cell's operation is described; calculations of the spatial deviation of the beam and the reflection coefficients of the structure are carried out.
31 - Metasurface-Based Tunable Reflector for Independent Control of Orthogonal Polarizations Poster [Show abstract]
  • Christophe Fisne, The French Aerospace Lab, France, France
  • Cédric Martel, The French Aerospace Lab, France
  • Anne-Laure Franc, University of Toulouse, France
  • Nathalie Raveu, University of Toulouse, France
<p> This paper presents a metasurface reflector, characterized with a 0° reflection phase, which can be tuned with variable capacitors to operate at any frequency within the band [1.1 – 1.7] GHz and intwo orthogonal polarizations independently.</p>
32 - Numerical Modeling of Tunable Nonlinear Graphene-Based Metamaterials, Metasurfaces and Metadevices for Nanophotonics Poster [Show abstract]
  • Galina Makeeva, Penza State University, Russia
  • Oleg Golovanov, Penza State University, Russia
  • Anatoly Rinkevich, Institute of Metal Physics Ural Branch of Russian Academy of Science, Russia
Interactions (including nonlinear processes) of electromagnetic waves (EMWs) with graphene-based metamaterials, metasurfaces and metadevices were numerically simulated using rigorous mathematical models to solve the nonlinear diffraction boundary problems. The nonlinearity thresholds for parametric excitation of EMWs in the graphene-based metadevices were determined by computing the bifurcation points of the nonlinear Maxwell’s operator, taking into account the constrained geometries.
33 - Tunable Photonics Crystal Slab Waveguide using Transparent Conductive Oxide No show [Show abstract]
  • Vishal Vashistha, AMU in Poznan, Poland
  • Maciej Krawczyk, Adam Mickiewicz University in Poznan, Poland
<p> Photonics crystal(PhC’s) are extensively studied for making integrated photonics components. PhC’s are used for light confinement such as a wave guide. The confinement of light is due to photonics band gap. In general, defect modes are used to guide the light in specific area. We proposed a new methods to control the transmission through the wave guide using transparent conducting oxides (TCO). We used Indium Tin Oxides (ITO) to imposed special boundary condition in epsilon near zero(ENZ) regime by applying the gate voltage across the PhC and ITO. When the negative voltage is applied across the ITO and PhC slab, the ITO behavior change from dielectric to metal due to conductivity modulation. Apart from bandgap, a sudden dip in transmission is observed when the voltage is applied across the device. This stops the transmission of light through the photonics crystal wave guide due to absorption of light. Our approach can be used to design tunable photonics crystal waveguide for guiding the light in specific region.</p>
34 - Terahertz Conductivity of Few Layer Graphene Intercalated with Ferric Chloride under Optical Pumping No show [Show abstract]
  • Mikhail Khodzitsky, ITMO University, Russia
  • Alexander Grebenchukov, ITMO University, Russia
  • Petr Demchenko, ITMO University, Russia
  • Anton Zaitsev, ITMO University, Russia
  • Anna Baldycheva, University of Exeter, United Kingdom
<p> One of the most important goals of terahertz (THz) science is investigation and development of new functional materials for dynamic manipulating the spectral and spatial properties of terahertz waves. The most promising candidates for this task are two-dimensional materials such as graphene or materials based on it. In this work we have studied the properties of novel material based on few layer graphene intercalated with ferric chloride in terahertz frequency range. In particular, the influence of infrared optical pumping on spectral properties of the material under investigation has been explored using 980 nm continuous-wave (CW) laser. It was shown that spectral characteristics and optical properties of few layer graphene intercalated with ferric chloride in THz range can be effectively controlled under IR pumping.</p>
35 - Impact of Optical Pumping on Carbon Nanotubes Permittivity in THz Frequency Range No show [Show abstract]
  • Mikhail Khodzitsky, ITMO University, Russia
  • Daniel Gomon, ITMO University, Russia
  • Ilya Anoshkin, Royal Institute of Technology, Sweden
  • Dmitrii Lioubtchenko, Royal Institute of Technology, Sweden
  • P. Demchenko, ITMO University, Russia
<p> Complex permittivity of carbon nanotubes was measured with/without light illumination in the frequency range of 0.2-1 THz. It was shown that we can tune the dispersion of carbon nanotubes complex conductivity during varying of optical pumping at wavelength of 980 nm. These results mean that CNT is perspective candidate for development of THz tunable attenuators and phase shifters.</p>
36 - Rapid Characterization of Metasurface Unit Cells using Scanning Differential Heterodyne Microscopy Poster [Show abstract]
  • Rucha Deshpande, University of Southern Denmark, Denmark
  • Ildar Akhmedzhanov, Russian Academy of Sciences, Russia
  • Dmitry Baranov, Russian Academy of Sciences, Russia
  • Evgeny Zolotov, Russian Academy of Sciences, Russia
  • Sergey Bozhevolnyi, University of Southern Denmark, Denmark
<p> In this study, Scanning Differential Heterodyne Microscopy (SDHM) technique as a tool for phase and amplitude characterization of unit cells in reflective phase-gradient metasurfaces has been investigated, aiming to predict far-field performance. SDHM has fundamental advantages of rapid, accurate, large-scale and non-contact scanning ability compared to other techniques. The results of SDHM and far-field characterization of previously used third-order gap-plasmon based metasurface for polarization splitting functionality are confirmed for TE polarization and further investigations to study merits and limitations of SDHM technique are discussed.</p>
37 - Quantitative 3D Imaging of Metasurfaces Phase Response Poster [Show abstract]
  • Jiří Babocký, Brno University of Technology, Czech Republic
  • Aneta Křížová, Brno University of Technology, Czech Republic
  • Lenka Štrbková, Brno University of Technology, Czech Republic
  • Lukáš Kejík, Brno University of Technology, Czech Republic
  • Filip Ligmajer, Brno University of Technology, Czech Republic
  • Martin Hrtoň, Brno University of Technology, Czech Republic
  • Alexander Faßbender, Rheinische Friedrich-Wilhelms Universität Bonn, Germany
  • Petr Dvořák, Brno University of Technology, Czech Republic
  • Matěj Týč, Brno University of Technology, Czech Republic
  • Jana Čolláková, Brno University of Technology, Czech Republic
  • Vlastimil Křápek, Brno University of Technology, Czech Republic
  • Radek Kalousek, Brno University of Technology, Czech Republic
  • Radim Chmelík, Brno University of Technology, Czech Republic
  • Tomáš Šikola, Brno University of Technology, Czech Republic
<p> In this paper, we report on investigation of phase-altering metasurfaces using Coherence-controlled holographic microscopy (CCHM). CCHM is wide-field, real-time, quantitative microscopy technique, that provides information about both amplitude and phase of light transmitted through metasurface. We demonstrate its ability to obtain phase information from the whole field of view in a single measurement on a prototypical sample consisting of silver nanodisc arrays. Finally, to reveal the full potential of CCHM, we employed it in the analysis of a simple metasurface represented by a plasmonic zone plate. By scanning the sample along the optical axis, we were able to create a quantitative 3D phase map of fields transmitted through the zone plate.</p>
38 - Tuned Thermal Conductivity of Poly(acrylic acid) by Metal Impregnation Poster [Show abstract]
  • Seung-Mo Lee, Korea Institute of Machinery & Materials, Korea (South)
  • Nguyen Quy Dat, Korea Institute of Machinery & Materials, Korea (South)
  • Jae-Hyun Kim, Korea Institute of Machinery & Materials, Korea (South)
<p> Here, we engineered the thermal conductivity of amorphous poly(acrylic acid) (PAA) polymer by metal impregnation phenomena which have been usually occurred during atomic layer deposition (ALD) process. We observed that the impregnated transition metals lead to noticeable changes in molecular structure of PAA, which consequently brings about increase in thermal conductivity of PAA. We believe that our method could be an effective way to produce layer-structured thermal metamaterials by which one can engineer thermal properties of various polymeric materials.</p>
39 - Theory of Graphene Plasmon Cavity Poster [Show abstract]
  • Xiaofei Xiao, Imperial College London, United Kingdom
  • Stefan A. Maier, Imperial College London, United Kingdom
  • Vincenzo Giannini, Imperial College London, United Kingdom
<p> Graphene is a very promising palsmonic candidate due to its unprecedented physical properties. In this paper, a theory of graphene palsmon cavity is established by deriving an analytical equation. The results shows that the analytical description can precisely predict the generation the plasmonic waves in the investigated system. This theory indicates that we can use the height of the cavity to tune grpahene plasmons.</p>
40 - Transmission Properties of the Plasmon-Polariton Gap in One-dimensional Kerr-metamaterial Superlatices No show [Show abstract]
  • Tiago Lobo, Universidade Federal de Alagoas, Brazil
  • Solange Cavalcanti, Federal de Alagoas, Brazil
The transmission properties of one-dimensional nonlinear layered systems composed of Kerr/metamaterial bilayers is investigated in the frequency range around the PP gap. A linear system analogue is proposed to explain the differences between the top and bottom edges of the PP gap.
41 - Lasing at K-point in Plasmonic Honeycomb Lattice Poster [Show abstract]
  • Marek Nečada, Aalto University, Finland
  • Rui Guo, Aalto University, Finland
  • Tommi Hakala, Aalto University, Finland
  • Aaro Väkeväinen, Aalto University, Finland
  • Päivi Törmä, Aalto University, Finland
<p> We observe lasing action at K-points in an active golden nanoparticle array with honeycomb geometry. By thorough analysis of the polarisation properties of the observed emission in both real and reciprocal space and with the help of group theory, we get the microscopical characterisation of the lasing mode. The utilised methods provide prospects for studies of topological systems obtained by breaking symmetries.</p>
42 - The Transverse Magneto-Optical Kerr Effect in a Plasmonic Structure with Non-Symmetric Nanoparticles Poster [Show abstract]
  • Andrey Kalish, Lomonosov Moscow State University, Russia
  • Maxim Goguev, Lomonosov Moscow State University, Russia
  • Alexey Kuzmichev, Russian Quantum Center, Russia
  • Vladimir Belotelov, Lomonosov Moscow State University, Russia
We investigate magneto-optical effects in triangular plasmonic nanoantennas placed on top of a magnetic dielectric layer. The resonantly enhanced transverse magneto-optical Kerr effect arises at normal incidence that is prohibited for symmetrical structures.
43 - Magnetoplasmonic Heterostructure Based on Nanoparticles and Gold Gratings Poster [Show abstract]
  • Roman Komarov, Lomonosov Moscow State University, Russia
  • Andrey Kalish, Lomonosov Moscow State University, Russia
  • Mikhail Kozhaev, Russian Quantum Center, Russia
  • Sergey Tomilin, Crimean Federal University, Russia
  • Anatoly Prokopov, Crimean Federal University, Russia
  • Vladimir Berzhansky, Crimean Federal University, Russia
  • Alexander Shaposhnikov, Crimean Federal University, Russia
  • Andrey Karavaynikov, Crimean Federal University, Russia
  • Vladimir Belotelov, Lomonosov Moscow State University, Russia
<p> Bases objective of our work - experimentally investigate the interaction of propagating and localized surface plasmon polaritons in magnetic nanocomposites containing gold nanoparticles in the dielectric layer and coated with gold gratings.</p>
44 - Numerical Simulations of Hybrid Sphere-gap-cone Dimer Nanoantenna Poster [Show abstract]
  • Sergey Makarov, ITMO University, Russia
  • Yali Sun, ITMO University, China
  • Dmitry Zuev, ITMO University, Russia
We numerically study optical properties of dimer metal-dielectric nanostructure representing the couple sphere-gap-cone nanoantenna separated by subwavelength gap. Numerical simulations demonstrate that the dimer exhibits magnetic and electric dipole resonances in the visible, strong field enhancement in the gap at the magnetic resonance as well as unidirectional scattering.
45 - Magnetic Plasmon Coupling in Connecting Deep-Subwavelength Plasmonic Metamaterial Resonators No show [Show abstract]
  • Zhen Liao, Hangzhou Dianzi University, China
  • Guo Qing Luo, Hangzhou Dianzi University, China
  • Tie Jun Cui, Southeast University, China
Magnetic resonance coupling theory for connected spoof localized surface plasmon (LSP) resonators are studied and experimentally demonstrated. The deep-subwavelength plasmonic resonators have dominantly conductive coupling through the current exchange. Two distinct interactions are observed in two different connection configurations. Based on the strong coupling, one-dimensional magnetic-plasmon propagation along in a chain of LSP resonators is proposed.
46 - Bose-Einstein Condensation in a Plasmonic Lattice Converted to oral [Show abstract]
  • Tommi Hakala, Aalto University, Finland
  • Antti Moilanen, Aalto University, Finland
  • Aaro Väkeväinen, Aalto University, Finland
  • Rui Guo, Aalto University, Finland
  • Jani-Petri Martikainen, Aalto University, Finland
  • Konstantinos Daskalakis, Aalto University, Finland
  • Heikki Rekola, Aalto University, Finland
  • Aleksi Julku, Aalto University, Finland
  • Päivi Törmä, Aalto University, Finland
We demonstrate a Bose-Einstein condensate (BEC) of surface plasmon polaritons in a lattice of metallic nanoparticles. Interaction of the surface plasmon modes with organic dye molecules induces thermalization by subsequent absorption and re-emission processes. With suitable lattice periodicity this interaction enables ultimately condensation in picosecond timescales. The dynamics are studied in an experiment that utilizes the propagation of the modes and the “open cavity character” of the system. Linewidth narrowing and increase of the spatial coherence of the mode is observed in response to onset of condensation. Transition from BEC to usual lasing is observed when the periodicity of the lattice is varied. This new form of condensate has also technological potential due to its ultrafast, room-temperature and on-chip nature.
47 - Babinet’s Principle for Plasmonic Antennas: Complementarity and Differences Poster [Show abstract]
  • Martin Hrtoň, Brno University of Technology, Czech Republic
  • Vlastimil Křápek, Brno University of Technology, Czech Republic
  • Michal Horák, Brno University of Technology, Czech Republic
  • Filip Ligmajer, Brno University of Technology, Czech Republic
  • Andrea Konečná, Materials Physics Center, San Sebastián, Spain
  • Jiří Babocký, Brno University of Technology, Czech Republic
  • Tomáš Šamořil, Brno University of Technology, Czech Republic
  • Michael Stöger-Pollach, Vienna University of Technology, Austria
  • Tomáš Šikola, Brno University of Technology, Czech Republic
<p> We study the Babinet-principle complementary plasmonic antennas (particles and apertures). Using theoretical simulations we show that both particles and apertures have similar energies of localized plasmon resonances and complementary near fields. On the other hand, experimental characterization by cathodoluminescence and electron energy loss spectroscopy reveals important differences, such as a better excitation efficiency for the apertures. We discuss the consequences for the application of the antennas in enhanced optical spectroscopy.</p>
48 - Refractive Index Engineering With Silver Nanodisc Metasurfaces For Developing Functional Films Poster [Show abstract]
  • Hideki Yasuda, Fujifilm corporation, Japan
  • Takeharu Tani, Fujifilm corporation, Japan
  • Masayuki Naya, Fujifilm corporation, Japan
We propose to use a silver nanodisc metasurface to engineer refractive index of thin films for developing functional films. In the presence of plasmon resonance, the effective refractive index of the metasurface is drastically changes around plasmon resonance wavelength. By utilizing refractive index engineering with silver nanodisc metasurfaces, we developed 2-types of functional films - transparent near infrared reflector and anti reflection coating.
49 - Electromagnetic Modeling and Design of Gold Nanoantennas on a Magnetic Dielectric for Ultrafast Magnetism Poster [Show abstract]
  • Daria Sylgacheva, Lomonosov Moscow State University, Russia
  • Mikhail Kozhaev , Prokhorov General Physics Institute, Russia
  • Alexander Chernov , Prokhorov General Physics Institute, Russia
  • Andrey Kalish, Lomonosov Moscow State University, Russia
  • Vladimir Belotelov, Lomonosov Moscow State University, Russia
<p> In this work, we calculated the optical properties of the plasmonic nanoantenna and arrays of subwavelength period, and optimized their size and shape with the purpose of excitation of localized surface plasmons and spin waves.</p>
50 - On the Plasmonic Resonances in a Layered Waveguide Structure Poster [Show abstract]
  • Yevhen Ivanenko, Linnaeus University, Sweden
  • Mariana Dalarsson, Linnaeus University, Sweden
  • Sven Nordebo, Linnaeus University, Sweden
  • Richard Bayford, Middlesex University, United Kingdom
An optimal plasmonic resonance and the associated Fröhlich resonance frequency are derived for a thin layer in a straight waveguide in TM mode. The layer consists of an arbitrary composite material with a Drude type of dispersion. The reflection and transmission coefficients of the layer are analyzed in detail. To gain insight into the behavior of a thin plasmonic layer, an asymptotic expansion to the first order is derived with respect to the layer permittivity.
51 - Tunable Reflection Type Plasmon Induced Transparency with Graphene Poster [Show abstract]
  • Mohsin Habib, Bilkent University, Turkey
  • Ekmel Ozbay, Bilkent University, Turkey
  • Humeyra Caglayan, Tampere University of Technology, Finland
Plasmon induced transparency (PIT) has always been investigated in transmission mode, in this work we propose a reflection type PIT device based on simple design of two parallel gold strips on graphene. We have numerically investigated the design by using Finite Difference Time-Domain (FDTD) method. This response is tunable by changing the Fermi level (Ef) of graphene. High tunability of 215 nm shift was observed by changing the Ef of graphene from 0 to 0.8 eV. The spectral contrast ratio of our device is 99.2%.
52 - Reflection Spectra from SiC Substrate with Circular-Slot Antennas and Influence of Surface-Plasmon Polaritons and on Surface-Phonon Polaritons Poster [Show abstract]
  • Kenichi Kasahara, Ritsumeikan University, Japan
  • Nobuyuki Umemori, Ritsumeikan University, Japan
  • Toyonari Yaji, Ritsumeikan University, Japan
  • Nobuhiko Ozaki, Wakayama University, Japan
  • Naoki Ikeda, National Institute for Materials Science, Japan
  • Yoshimasa Sugimoto, National Institute for Materials Science, Japan
Surface-phonon polariton and surface-plasmon polariton signals were observed to appear at the same time in the spectra of circular slot antennas formed on the surface of SiC. The resonance spectrum of the surface-phonon polariton varied with the wavelength shift of the surface-plasmon polariton, indicating the interaction of two signals.
53 - On the Optimal Plasmonic Resonances in Lossy Media Poster [Show abstract]
  • Sven Nordebo, Linnaeus University, Sweden
  • Mariana Dalarsson, Linnaeus University, Sweden
  • Mats Gustafsson, Lund University, Sweden
  • Daniel Sjöberg, Lund University, Sweden
<p> An optimal plasmonic resonance is derived for small homogeneous and isotropic inclusions in a lossy surrounding medium. The optimal resonance is given in terms of any particular eigenmode (electrostatic resonance) associated with the double-layer potential for a smooth, but otherwise arbitrary surface.</p>
54 - Electromagnetic Modeling of Finite Fragments of Metamaterials and Metasurfases based on Method of Minimal Autonomous Blocks No show [Show abstract]
  • Yauheni Arlou, Belarusian State University, Belarus
  • Sergei Maly, Belarusian State University, Belarus
  • Eugene Sinkevich, Belarusian State University of Informatics and Radioelectronics, Belarus
Technique to calculate electromagnetic properties of finite fragments of frequency-selective screens, metasurfaces and flat layers of metamaterials based on method of minimal autonomous blocks is proposed. Use of multichannel macroblocks typical for the problem and scattering matrices characterizing them is base of the technique. Application of multichannel macroblocks makes it possible to significantly decrease requirement to RAM compared to other computational electomagnetics methods. Use of several types of macroblocks allows to take into consideration local defects of the structure. The technique makes it possible to model arbitrary excitation modes of finite structures by local and remote sources. Modeling results of finite fragment of frequency-selective surface with complicated structure of unit cell are given.
55 - Quasi-Static Metamaterials with Million-Times Enhanced Susceptibilities over Many Decades of Frequencies Poster [Show abstract]
  • Taeyong Chang, KAIST, Republic of Korea
  • Yong-Hee Lee, KAIST, Republic of Korea
  • Jonghwa Shin, KAIST, Republic of Korea
Natural materials have a limited range of linear and nonlinear susceptibilities. Resonant metamaterials may enhance these values by several orders of magnitude but the effect is typically very narrowband and the effective material properties are highly dispersive. Here, it is theoretically and experimentally shown that metamaterials designed by quasi-static boundary conditions can have linear and nonlinear susceptibility that are enhanced by more than a million times over a broad frequency range spanning many decades with very small dispersion. An effective electric permittivity larger than three million is experimentally verified and the nonlinear coefficients are rigorously calculated based on nonlinear finite-difference time-domain simulations and a nonlinear transfer matrix method.
56 - Synthesis of Metamaterials Based on the Minimal Autonomous Blocks Method and Deep Learning Technology No show [Show abstract]
  • Sergey Maly, Belarusian State University, Belarus
  • Alexander Dezhurko, Belarusian State University, Belarus
  • Hanna Arlova, Belarusian State University, Belarus
<p> A technique for the synthesis of structurally non-uniform materials (composites, metasurfaces, metamaterials) based on the minimal autonomous blocks method and deep learning technology is proposed. The aim of the synthesis is to determine the internal structure and material composition of the block, the averaged scattering matrix of which is close to the given one. The properties of a multilayer neural network are described. The results of synthesis of two-dimensional non-uniform blocks using a previously trained neural network are presented.</p>
57 - Inverse Homogenization of a Quasiperiodic Composite Poster [Show abstract]
  • Elena Cherkaev, University of Utah, USA
  • Sebastien Guenneau, Aix-Marseille Universite, Institut Fresnel, France
  • Niklas Wellander, Swedish Defence Research Agency, Sweden
The paper deals with inverse homogenization of an electrostatic problem where the geometry on a microscopic scale is given by a quasiperiodic distribution of piecewise constant components defined by the use of a mapping R: Rn to Rm, m bigger than n, and a periodic unit cell in Rm. Inverse homogenization makes use of a Stieltjes analytic representation for the effective complex conductivity, which depends upon R, unlike for the periodic case.
58 - Selection Rules In Second Harmonic Generation Process Supported By Mie Resonances Poster [Show abstract]
  • Kristina Frizyuk, ITMO University, Russia
  • Mihail Petrov, ITMO University, Russia
In the paper we discuss the second harmonic generation from spherical dielectric nanoparticles possessing bulk nonlinear tensor χ. Having high refractive index, subwavelength nanoparticle demonstrate Mie resonances in the optical spectrum. We theoretically study how the polarization structure of Mie modes govern the SHG process. We identify the allowed transitions by building the selection rules, basing on the Mie theory. Moreover, one can develop a group theory approach, extrapolating it over nanoparticles of more complicated shape.
59 - Surface-to-Propagating Wave Conversion Using Metasurfaces: Canonical Solution Poster [Show abstract]
  • Svetlana Tcvetkova, Aalto University, Finland
  • Stefano Maci, University of Siena, Italy
  • Sergei Tretyakov, Aalto University, Finland
We investigate surface wave to propagating wave conversion. The exact solution of the boundary problem for an impedance surface which fully transforms a given surface wave into a propagating inhomogeneous plane wave (with a polarization transformation) is found, discussed, and numerically demonstrated. The results of the study are of importance for creating leaky-wave antennas with the ultimate efficiency, and can potentially lead to many novel applications, from microwave techniques to nanophotonics.
60 - The Physics of Self-Complementary Metasurfaces Under Circularly Polarized Waves Poster [Show abstract]
  • Julian D. Mateus, Universidad Nacional de Colombia, Colombia
  • Juan P. del Risco, Universidad Sergio Arboleda, Colombia
  • Andrey Sayanskiy, ITMO University, Russia
  • Stanislav B. Glybovski, ITMO University, Russia
  • Juan D. Baena, Universidad Nacional de Colombia, Colombia
Self-complementary metasurfaces illuminated with circular polarization are studied in this paper. Some general properties for the transmission and reflection coefficients are derived. Here a self-complementary metasurface composed of rectangular holes and rectangular patches was simulated to obtain the scattering parameters. This geometry may be used for conversion from circular to linear polarization with any polarization angle or broadband power dividing.
61 - Validity of homogenization for Artificial Plasmas: Straight Strips Versus Zigzag Strips Poster [Show abstract]
  • Jesús Alberto Parra Peña, Universidad Nacional de Colombia, Colombia
  • Andrey Sayanskiy, ITMO University, Russia
  • Dmitry Zhirihin, ITMO University, Russia
  • Stanislav B. Glybovski, ITMO University, Russia
  • Juan Domingo Baena Doello, Universidad Nacional de Colombia, Colombia
Artificial plasmas are described by two theoretical models: continuous and discrete models. We have numerically probed them with two specific geometries based on straight strips and zigzag strips. It has been found that the discrete model is always accurate. It is remarkable that the continuous model is accurate only for the zigzag strips.
62 - Topological Interface between Anisotropic Materials for Transverse Spinning of Light Fields Poster [Show abstract]
  • Xianji Piao, Seoul National University, Korea (South)
  • Sunkyu Yu, Seoul National University, Korea (South)
  • Minpyo Lee, Seoul National University, Korea (South)
  • Namkyoo Park, Seoul National University, Korea (South)
<p> We demonstrate the achievement of transverse spinning of light fields with globally unique handedness, by introducing an interface between two anisotropic metamaterials of different topologies in k-space. We also introduce a novel polarization state in the meridional plane with zero transverse spin component based on inverse design method.</p>
63 - Transition Conditions to Simulate Biaxial Anisotropic Thin Slab No show [Show abstract]
  • Nezahat Gunenc Tuncel, University of Cukurova, Turkey
  • A. Hamit Serbest, University of Cukurova, Turkey
<p> The transition conditions for biaxial anisotropic thin slab is investigated. The all field components are written in terms of z components of the electric and magnetic fields. Then, an external field is associated by using the internal field expression. To verify obtained transition conditions, the reflection and refraction problem is solved by using both the transition and exact boundary conditions in case the slab is metamaterial. The results are in good agreement.</p>
64 - Mode Conversion of Parallel Plate Waveguide with Periodic Membranes Poster [Show abstract]
  • Takaaki Minamigaito, Kansai University, Japan
  • Toshiaki Kitamura, Kansai University, Japan
  • Yasushi Horii, Kansai University, Japan
Two-dimensional parallel-plate waveguides with periodic membranes are analyzed through the finite-difference time-domain (FDTD) simulations and the effect of mode conversion on the propagation characteristics is investigated. The width and length of the waveguide are set to be the similar values as stretching-out human cochlea. It is estimated how the miniature membranes, which are aligned periodically, affect the transmission characteristics of the waveguide. The particle velocity fields are investigated and the transmission characteristics are discussed based on the mode conversion and the cutoff of the higher modes of the waveguide.
65 - Tunable Frequency Conversion With Coupled Time-Modulated Cavities Poster [Show abstract]
  • Galaad Altares Menendez, University of Mons, Belgium
  • Bjorn Maes, University of Mons, Belgium
We present a new way to achieve selective frequency conversion using a system of two coupled cavities. We show that the coupling between the cavities allows to select frequencies for which the conversion is enhanced. This mechanism is fairly general and can be applied to any system of coupled resonances.
66 - Revisiting the Boundary Effects of Weak Nonlocality in Multilayered Dielectric Metamaterials: A Trace and Anti-trace Map Approach Poster [Show abstract]
  • Giuseppe Castaldi, University of Sannio, Italy
  • Andrea Alù, University of Texas at Austin, USA
  • Vincenzo Galdi, University of Sannio, Italy
Counterintuitively, under certain critical conditions, weak nonlocality typically ex- hibited by multilayered dielectric metamaterials may build up strong boundary effects that are not captured by conventional (local) effective-medium models based on simple mixing formulas. Here, we propose an alternative description, based on the trace and anti-trace map formalism, which effectively parameterizes this phenomenon and provides useful physical insight.
67 - A Study of Spectral Singularities in Non-Hermitian Cylindrical Core-Shell Geometries Poster [Show abstract]
  • Massimo Moccia, University of Sannio, Italy
  • Giuseppe Castaldi, University of Sannio, Italy
  • Andrea Alù, University of Texas at Austin, USA
  • Vincenzo Galdi, University of Sannio, Italy
We revisit the concept of spectral singularities in a framework of non-Hermitian cylindrical core-shell geometries featuring suitable distributions of gain and losses. In particular, we show that implied additional degrees of freedom allow a precise tailoring of such resonant phenomena and the engineering of exotic scattering responses.
68 - The Concept of Active Metasurface-based Electromagnetic Wave Cancellation No show [Show abstract]
  • Joisp Lončar, University of Zagreb, Croatia
  • Borna Jelačić, University of Zagreb, Croatia
<p> A novel concept of active metasurface-based electromagnetic wave cancellation is presented. Unlike conventional absorbers, which dissipate electromagnetic radiation, the proposed active device reflects an incident wave simultaneously generating a new wave that destructively interferes with the reflected one. The concept promises broadband behavior, ultra-thin design and stable operation.</p>
69 - Negative Refraction in Plasma and Magnetic Materials Poster [Show abstract]
  • Naghi Gasimov, Cukurova University, Turkey
  • Faruk Karadag, Cukurova University, Turkey
  • Muharrem Karaaslan, Iskenderun Technical University, Turkey
  • Victor Veselago, Russian Academy of Sciences, General Physics Department, Russia
The possibility of negative refractive index in plasma and magnetic materials was considered. It is shown that, neglecting losses leads to losing important features about refractive index. Therefore, the imaginary parts of dielectric permittivity and magnetic permeability is taken into account for an accurate statement of the problem.
70 - Storage and Retrieval of Electromagnetic Waves with Metamaterial Analog of Electromagnetically Induced Transparency Poster [Show abstract]
  • Toshihiro Nakanishi, Kyoto University, Japan
  • Masao Kitano, Kyoto University, Japan
<p> We demonstrate the storage of electromagnetic waves in a nonlinear metamaterial, which provides an exact analog to electromagnetically induced transparency (EIT) in an atomic system. In our experiment, we realize the storage of the electromagnetic waves by turning the control waves off, and also achieve the retrieval of the stored waves by the reintroduction of the control waves.</p>
71 - Magnetic Permeability Spectra of Metamaterials Composed of Split Cut Wires Retrieved from Circuit Theory Poster [Show abstract]
  • Sung-Soo Kim, Chungbuk National University, Korea (South)
  • Joon-Hee Lim, Chungbuk National University, Korea (South)
  • Min-Sung Kim, Chungbuk National University, Korea (South)
Frequency dispersion of magnetic permeability has been theoretically predicted in a metamaterial composed of split cut wires (SCW) and cut wires (CW) separated by dielectric substrate on the basis of circuit theory. Magnetic resonance resulting from antiparallel currents between the SCW and CW is observed at the frequency of minimum reflection loss (corresponding to absorption peak) and effective resonator size can be determined. Calculating the circuit parameters (inductance L, capacitance C) and resonance frequency from SCW dimension, the frequency dispersion of permeability of Lorentz like magnetic response can be predicted as a function of resistance R. The simulated resonance frequency and permeability spectra can be explained on the basis of the circuit theory of an RLC resonator.
72 - Plane Wave Diffraction by a 90° Wedge Coated by Metamaterial Slabs: a Uniform Asymptotic Solution in the Case of Normal Incidence Poster [Show abstract]
  • Giovanni Riccio, University of Salerno, Italy
  • Gianluca Gennarelli, I.R.E.A. - C.N.R., Italy
This paper is relevant to the diffraction problem concerning a right-angled perfectly conducting wedge, which is coated by a single lossy metamaterial layer. A uniform asymptotic solution is supplied in the case of plane waves at normal incidence with respect to the edge. It is obtained in the framework of the uniform theory of diffraction by means of an analytical procedure, which starts from the far-field radiation integral using electric and magnetic surface currents expressed under the physical optics approximation. The proposed solution is user-friendly since it is expressed in closed form. It contains the geometrical optics response of the structure and the transition function of the uniform theory of diffraction.
73 - On the Dyakonov Waves Guided by the Interface with a Columnar Thin Film Poster [Show abstract]
  • Muhammad Faryad, Lahore University of Management Sciences, Pakistan
  • Farhat Abbas, The University of Texas at Dallas, USA
Dyakonov surface waves are guided by an interface of a homogeneous, isotropic, lossless dielectric material and a homogeneous anisotropic dielectric material. However, the range of angles for which Dyakonov waves exist in the interface plane is very tiny, typically less than 1 deg. In this work, we show that this range can be extended to as much as 360 deg, if the partnering isotropic dielectric material is lossy. These surface waves are dubbed as Dyakonov-Uller-Zenneck (DUZ) surface waves because the surface waves guided by an interface of two isotropic lossy dielectric materials were predicted by Uller and Zenneck.
74 - Perfect Absorption and Total Reflection in Space-Coiled Sub-Wavelength Channels No show [Show abstract]
  • Anastasiia O. Krushynska, University of Trento, Italy
  • Vincent Romero-Garcia, Universite du Mans, France
  • Federico Bosia, University of Torino, Italy
  • Nicola M. Pugno, University of Trento, Italy
  • Jean-Philippe Groby, Universite du Mans, France
<p> Perfect absorption and total reflection are fascinating phenomena with multiple applications. We demonstrate that the mechanism of slow sound propagation in combination with space-coiling of a wave path can be efficiently used to induce/achieve these phenomena in narrow channels at low frequencies. The reported concept opens novel possibilities for designing compact sub-wavelength absorbers and scatterers.</p>
75 - A Bi-functional Metamaterial Simultaneously for acoustic Insulation and Electromagnetic Diffusion No show [Show abstract]
  • Cheng Zhang, Southeast University, China
  • Wenkang Cao, Southeast University, China
  • Qiang Cheng, Southeast University, China
<p> Metamaterials have been adopted to manipulate the propagations behaviors of elastic waves or electromagnetic waves individually. However, joint control of such two fields via metamaterial is rarely reperted. Therefor we present the design of a bi-functional metamaterial, which can achieves acoustic insulation and electromagnetic diffusion simultaneously.</p>
76 - Sound Transmission Loss of Locally Resonant Metamaterial and Phononic Crystal Plates Poster [Show abstract]
  • Lucas Van Belle, KU Leuven, Belgium
  • Claus Claeys, KU Leuven, Belgium
  • Elke Deckers, KU Leuven, Belgium
  • Wim Desmet, KU Leuven, Belgium
This paper investigates the sound transmission loss of locally resonant metamaterial and phononic crystal plates using unit cell and finite plate analysis. Plates with flexural wave stop bands can lead to enhanced vibro-acoustic performance. The acoustic insulation performance and frequency range depends, however, on the underlying stop band mechanism. While unit cell analysis suggests sound transmission loss improvements regardless of the mechanism, the vibro-acoustic performance of their finite plate counterparts can differ significantly.
77 - High-order Modes Of Spoof Surface Acoustic Waves Converted to oral [Show abstract]
  • Liting Wu, State Key Laboratory of Millimeter Waves, Southeast University, China
  • Wenkang Cao, State Key Laboratory of Millimeter Waves, Southeast University, China
  • Gangyong Song, State Key Laboratory of Millimeter Waves, Southeast University, China
  • Qiang Cheng, State Key Laboratory of Millimeter Waves, Southeast University, China
  • Tiejun Cui, State Key Laboratory of Millimeter Waves, Southeast University, China
<p> Spoof surface acoustic waves (SSAWs), achieved by the perfect rigid body (PRB) textured with subwavelength structures, can support strongly localized surface waves. Here, we explore the high-order modes of SSAWs in the corrugated structures with large height, whose impact on the dispersion relations are intensively discussed. The high-order modal fields are analyzed for better understanding of the underlying physics in SSAW generation.</p>
17:30 - 19:30 - Anniversary Event
19:30 - 22:30 - Gala dinner
30 August 2018 / Start time: 9 h 0 min
09:00 - 10:00 - Plenary session IV
09:00 - Plenary session IV

Session chairperson(s): Andrea Alu

09:00 - 10:00 - Seeing A Single Atom Where It Is Not Plenary [Show abstract]
  • Arno Rauschenbeutel, Humboldt-Universität zu Berlin, Germany
  • Gabrie Araneda, Universität Innsbruck, Austria
  • Stefan Walser, TU Wien, Austria
  • Yves Colombe, Universität Innsbruck, Austria
  • Daniel B. Higginbottom, Universität Innsbruck, Austria
  • Jürgen Volz, TU Wien, Austria
  • Rainer Blatt, Universität Innsbruck, Austria
I will show that, for a perfect, aberration-free optical imaging system like an ideal optical microscope, the image of an elliptically polarized emitter does not coincide with the emitter's real position. Imaging a single atom as well as a single gold nanoparticle, we demonstrate this effect and observe wavelength-scale shifts.
10:00 - 10:30 - Coffee break (Thursday morning) - Meet-and-greet the Physical Review Editors
10:30 - 12:30 - Oral sessions (Thursday morning)
10:30 - Special session: Nanoarchitectronics

Organizer(s): Stefano Maci; Anatoly Zayats

Session chairperson(s): Stefano Maci; Anatoly Zayats

10:30 - 11:00 - Nanoarchitectronics Invited oral [Show abstract]
  • Jouni Ahopelto, VTT, Finland
Interdisciplinary research area at the crossroad of Nanophotonics, Electromagnetics and Nanoelectronics. It is a new technology aimed at conceiving, designing and developing reconfigurable, adaptive and cognitive structures, sensorial surfaces and functional “skins” with unique physical properties, and engineering applications in the whole electromagnetic spectrum; through assembling building blocks at nanoscale in hierarchical architectures. The conception of this new area responds to the need of unifying concepts, methodologies and technologies in Communications, Environment Sensing Systems, Safety and Security, Bio-Sensing Systems and Imaging Nanosystems, within a wide frequency range. The FET project called NTX, funded by the European Framework of Research “Horizon 2020”, gathers thirteen universities, research centers and high-tech industries, belonging to eight European countries. According to the FET work-program, the major objective of “Nanoarchitectronics” is to boost the future application-driven research through the establishment of an accepted language among physicists and engineers, a shared way of thinking, a common theoretical foundation and a common strategy for the future. Therefore, the project aims at laying the foundation for an ever-increasing synergy and progress of Nanoarchitectronics.
11:00 - 11:15 - Nanoarchitectronics: the New Paradigm of Airborne Systems Invited (15 minutes) [Show abstract]
  • Jean Chazelas, Thales DMS, France
  • Charlotte Tripon-Canseliet, PSL/ESPCI, France
The objective of this talk is to address the impact of the nanoarchitectronics paradigm on advanced airborne systems. It will review some applications of the nanomaterial and nanotechnology concepts to the future smart skins systems.
11:15 - 11:30 - Metamaterials in the Time Domain Invited (15 minutes) [Show abstract]
  • J.B. Pendry, Imperial College London, United Kingdom
Conventional metamaterials rely on their spatial structure for their performance. However, it is often possible to reconfigure the internal structure and hence introduce time dependence adding the dimension of time to the possible variables. I shall present results for very simple time dependent metamaterials and make some speculations for their future deployment.
11:30 - 11:45 - Structured Waves Invited (15 minutes) [Show abstract]
  • Nader Engheta, University of Pennsylvania, USA
One of the interesting features of metamaterials and metastructures is the ability to sculpt and structure fields and waves in ways not readily achievable with conventional platforms. Such manipulation of waves by means of specialized materials has opened new venues for light-matter interaction, with particular attention to novel functionalities. Extreme light-matter interaction can be accomplished by extreme materials. We have explored a variety of "structured waves", in which some forms of extreme platforms have been utilized to tailor structured light. Some of these scenarios include (1) optical metatronics and quantum metatronics, (2) "informatic" materials for analog computing, (3) temporal and spatio-temporal metastructures, (4) near-zero-index photonic platforms, (5) one-atom-thick optical devices, (6) quantum optics with zero index, (7) photonic doping, and (8) designer metasurfaces, just to name a few. In this talk, I will give a brief overview of some of these structured wave platforms.
11:45 - 12:00 - Metatronics Concept and its extension within the H2020 NanoArchitectronics Project: Definition and Potential Impact Invited (15 minutes) [Show abstract]
  • Filiberto Bilotti, RomaTre University, Italy
  • Davide Ramaccia, RomaTre University, Italy
  • Sergei Tretyakov, Aalto University, Finland
  • Constantin Simovski, Aalto University, Finland
  • Andrea Massa, University of Trento, Italy
  • Giacomo Oliveri, University of Trento, Italy
  • Stefano Maci, University of Siena, Italy
  • Clivia Sotomayor-Torres, Catalan Institute of Nanoscience and Nanotechnology (ICN2), Spain
  • Charlotte Tripon-Canseliet, ESPCI, France
  • Giampiero Gerini, TNO, Netherlands
  • Jouni Ahopelto, VTT, Finland
  • Anatoly Zayats, King's College London, United Kingdom
  • Giuseppe Vecchi, Politecnico de Turin, Italy
  • Davide Mencarelli, Università Politecnica delle Marche, Italy
  • Luca Pierantoni, Università Politecnica delle Marche, Italy
  • Bruno Casali, IDS S.p.A., Italy
  • Thomas Bertuch, Fraunhofer Inst. High Frequency Physics & Radar Techniques FHR, Germany
  • Kai Herbertz, Fraunhofer Inst. High Frequency Physics & Radar Techniques FHR, Germany
  • Jean Chazelat, Thales SA, Thales Research and Technology, France
Metatronics (MTX) was introduced by Nader Engheta in 2007 as a new concept that unifies the fields of electronics and photonics, introducing “circuit elements” for light, in analogy with circuit elements used in electronics: capacitors, inductors, transistors, etc. Thanks to the recent advancements in metamaterial technology, the concept of MTX can be further extended, considering the current technological achievements allowing material properties to be dynamically controllable in both space and time. This would open a multitude of new applications and scientific explorations. In this contribution, we briefly review the MTX concept, present its extension within the H2020 NANOARCHITECTRONICS project, discuss about the impact that MTX will have on European technology and competitiveness, and identify the current centers of excellence in Europe.
12:00 - 12:30 - Round Table Round Table Discussion [Show abstract]
  • A. Zayats, King's College London, UK
  • S. Maci, University of Siena, Italy
  • F. Bilotti, Roma Tre University, Italy
  • J. Chazelas, THALES-SA, France
  • Nader Engheta, University of Pennsylvania, USA
  • John Pendry, Imperial College, UK
Round Table of the NANOARCHITECTRONICS special session.
10:30 - Nonlinear metamaterials II

Session chairperson(s): Karim Achouri; Andrey Fedyanin

10:30 - 10:45 - Less is More – Enhancing Second-harmonic Generation from Metasurfaces by Engineering Interparticle Interactions Oral [Show abstract]
  • Mikko Huttunen, Tampere University of Technology, Finland
  • Robert Czaplicki, Nicolaus Copernicus University, Poland
  • Antti Kiviniemi, Tampere University of Technology, Finland
  • Xiaorun Zang, Tampere University of Technology, Finland
  • Timo Stolt, Tampere University of Technology, Finland
  • Ismo Vartiainen, University of Eastern Finland, Finland
  • Jeremy Butet, Swiss Federal Institute of Technology, Switzerland
  • Markku Kuittinen, University of Eastern Finland, Finland
  • Olivier Martin, Swiss Federal Institute of Technology, Switzerland
  • Martti Kauranen, Tampere University of Technology, Finland
We demonstrate a considerable enhancement of second-harmonic generation from metasurfaces due to strong interparticle interactions. Two different arrays of V-shaped gold nanoparticles are characterized. While both arrays exhibit similar linear responses, their nonlinear responses are remarkably different. Second-harmonic emission from the optimized array is found to be over five-fold enhanced.
10:45 - 11:00 - Homogenization and Scattering Analysis of Second-Order Nonlinear Metasurfaces Oral [Show abstract]
  • Karim Achouri, EPFL, Switzerland
  • Gabriel D. Bernasconi, EPFL, Switzerland
  • Jérémy Butet, EPFL, Switzerland
  • Olivier J. F. Martin, EPFL, Switzerland
We present an extensive discussion on the homogenization and scattering analysis of second-order nonlinear metasurfaces. We use the generalized sheet transition conditions (GSTCs) in the frequency-domain to model the electromagnetic responses of nonlinear metasurfaces. We present the general second-harmonic scattering relations, in the undepleted pump regime approximation, and the resulting reflectionless, transmissionless and asymmetric reflection and transmission conditions. Finally, to clarify certain misconceptions, we also discuss the concept of nonreciprocal scattering in nonlinear optics.
11:00 - 11:30 - Transient Nonlinear-Optical Response of All-Dielectric Nanostructures and Metasurfaces Invited oral [Show abstract]
  • Andrey Fedyanin, Lomonosov Moscow State University, Russia
The talk surveys the results of the experimental studies of the nonlinear-optical effects of all-dielectric nanoantennas and metasurfaces formed from Mie-resonant dielectric nanoparticles. The effects of the second- and third harmonics generation as well as ultrafast effects related to optical nonlinearities are discussed. The main material used in all-dielectric nanostructures possessing low-order magnetic-dipole resonances is silicon (crystalline and amorphous one). We also demonstrate that plenty of other semiconductors both indirect as germanium and direct as gallium arsenide can be used as a good platform for fabricating all-dielectric nanostructures having intriguing nonlinear effect upon interaction with laser electric field. Strong light localization as well as the realization of the phase matching conditions are discussed as possible mechanisms of the observed enhancement of the nonlinear-optical effects.
11:30 - 12:00 - Structural Second Harmonic Nonlinearity in Plasmonic Metamaterials Invited oral [Show abstract]
  • Viktor Podolskiy, U Mass Lowell, USA
  • Brian Wells, U Mass Lowell, USA
  • Anton Bykov, King's College London, UK
  • Giuseppe Marino, King's College London, UK
  • Mazhar Nasir, King's College London, UK
  • Anatoly Zayats, King's College London, UK
We demonstrate that spectral and polarization control of second harmonic generation in plasmonic metamaterials can be engineered in terms of effective bulk second harmonic polarizability of the metamaterial composite. Our analytical results are validated via both experimental studies and numerical solutions of the Maxwell equations
12:00 - 12:30 - Low-Index Materials for Enhanced Optical Nonlinearities Invited oral [Show abstract]
  • Clayton DeVault, Purdue University, United States
  • Vincenzo Bruno, Heriot-Watt University, United Kingdom
  • Stefano Vezzoli, Heriot-Watt University, United Kingdom
  • Thomas Roger, Heriot-Watt University, United Kingdom
  • Soham Saha, Purdue University, United States
  • Marcello Ferrera, Heriot-Watt University, United Kingdom
  • Matteo Clerici, University of Glasgow, United Kingdom
  • Audrius Dubietis, Vilnius University, Lithuania
  • Alexandra Boltasseva, Purdue University, United States
  • Daniele Faccio, Heriot-Watt University and University of Glasgow, United Kingdom
  • Vladimir Shalaev, Purdue University, United States
Low-index materials are well suited for optical nonlinearities due to their inherent ability to enhance electric fields and satisfy phase-matching conditions. Here, we investigate the nonlinear optical properties of the low-index material, aluminum-doped zinc oxide, and demonstrate generation of time-reversed beams and plasmonic strong-coupling signatures in epsilon-near-zero films. Our results corroborate the outstanding potential of low-index materials and provide foundational support for future studies.
10:30 - Metasurfaces I

Session chairperson(s): Nima Chamanara; Younes Ra'di

10:30 - 11:00 - All-dielectric Mie-resonant Meta-optics Invited oral [Show abstract]
  • Yuri Kivshar, Australian National University, Australia
Recently emerged new field of all-dielectric resonant meta-optics aims at the manipulation of strong optically-induced Mie-type resonances in dielectric nanostructures and metasurfaces with high refractive index. Unique advantages of dielectric resonant nanostructures over their metallic counterparts are low dissipative losses, a wide range of multipolar interferences, and the enhancement of both electric and magnetic fields that provide competitive alternatives for plasmonic structures including optical nanoantennas, efficient biosensors, passive and active metasurfaces, and functional metadevices. This talk will summarize the most recent advances in the field of all-dielectric Mie-resonant meta-optics including active nanophotonics as well as the recently emerged directions of topological photonics and nonlinear metasurfaces.
11:00 - 11:15 - Mie-Resonance-Enhancing Electric-Dipole Emissions on All-Dielectric Metasurfaces Oral [Show abstract]
  • Masanobu Iwanaga, National Institute for Materials Science, Japan
We report our experimental finding on a new capability of the dielectric metasurfaces comparable to selected plasmonic metasurfaces, that is, fluorescence-enhancing performance. At some of Mie resonances in the dielectric metasurfaces, the intensity enhancement becomes approximately 1000-fold for non-enhancing silicon wafers.
11:15 - 11:30 - Plasmonic Meta-Surfaces Dispersionless Both Temporally And Spatially Oral [Show abstract]
  • Aristeidis Karalis, MIT, USA
  • John Joannopoulos, MIT, USA
A linear passive plasmonic meta-surface platform is introduced to accomplish simultaneous cancellation of temporal and spatial dispersion to high orders for subwavelength slow light.
11:30 - 11:45 - Metagratings for Efficient Wavefront Manipulation Oral [Show abstract]
  • Younes Ra'di, The University of Texas at Austin, United States
  • Andrea Alù, The University of Texas at Austin, United States
Metagratings are two-dimensional periodic arrays of individual scatterers that enable highly-efficient extreme wave transformation which was impossible using conventional metasurfaces. We review our recent progress in this area and, notably, discuss metagrating designs based on asymmetric electric dipoles that are practically easier to realize compared to bianisotropic inclusions. In addition, we present the design of a tunable metagrating based on graphene strips. It will be shown that the proposed structure can provide multiple functionalities by tuning just two bias voltages. The efficiency of the proposed design is only limited by dissipation in graphene.
11:45 - 12:00 - Metasurfaces with Interleaved Electric and Magnetic Resonances for Broadband Arbitrary Group Delay in Reflection Oral [Show abstract]
  • Odysseas Tsilipakos, Foundation for Research and Technology - Hellas, Greece
  • Thomas Koschny, Ames Laboratory and Iowa State University, USA
  • Costas Soukoulis, Foundation for Research and Technology Hellas & Ames Laboratory and Iowa State University, Greece & USA
We demonstrate metasurfaces that can perfectly reflect arbitrarily broadband pulses imparting on them a prescribed group delay without distorting the pulse shape, opening new possibilities for dispersion engineering across deeply subwavelength physical scales. This is achieved by implementing multiple, properly-arranged resonances in the electric and magnetic sheet admittivities.
12:00 - 12:15 - Self-Complementary Tessellations as Universal Design Approach for LP-to-CP Transforming Frequency Selective Surfaces Oral [Show abstract]
  • Stanislav Glybovski, ITMO University, Russia
  • Andrey Sayanskiy, ITMO University, Russia
  • Sergei Kuznetsov, Rzhanov Institute of Semiconductor Physics SB RAS, Novosibirsk State University, Russia
  • Juan del Risco, Universidad Nacional de Colombia, Colombia
  • Alexey Slobozhanyuk, ITMO University, Russia
  • Pavel Belov, ITMO University, Russia
  • Juan Baena, Universidad Nacional de Colombia, Colombia
Recently self-complimentary frequency-selective surfaces (FSSs) have been shown capable of linear-to-circular polarization transformation. In this work we numerically and experimentally prove generality of this approach showing that similar self-complimentary tessellations can be used as FSS patterns in both the microwave and the sub-millimeter wave ranges. Moreover, we simulated two Escher’s tessellations as patterns of microwave FSSs to further demonstrate the polarization transform function of arbitrary self complimentary FSSs.
12:15 - 12:30 - A Transparent, Time-Modulated Metasurface Oral [Show abstract]
  • Zhanni Wu, the University of Michigan, United States
  • Anthony Grbic, the University of Michigan, United States
A transparent, time-modulated metasurface that can perform frequency conversion in the X-band is reported. The metasurface provides high transmission amplitude and an electrically driven, time-modulated transmission phase. Depending on the time-dependent transmitted phase variation, the metasurface can either upconvert or downconvert (Doppler shift) the frequency of the incident wave, without generating an undesired image frequency.
10:30 - Light control through metamaterials

Session chairperson(s): Owen Miller; Vassili Fedotov

10:30 - 11:00 - Flat Optics: from Metalenses to Structured Light Invited oral [Show abstract]
  • Federico Capasso, Harvard University, USA
Arrays of optically thin, sub-wavelength spaced optical elements (metasurfaces) have major potential for wavefront shaping through local control of the phase, amplitude and polarization of light. Flat optics has emerged from this approach with the goals of replacing refractive lenses in most applications requiring aberrations' correction as well as conventional phase plates used in polarization optics and last but not least of providing a new path to the creation of structured light.
11:00 - 11:30 - Fundamental Limits To Light-Matter Interactions Invited oral [Show abstract]
  • Owen Miller, Yale, USA
When light interacts with nanophotonic matter, what is the strongest possible optical response? I will describe energy-conservation principles that form the foundation for general limits to light-matter interactions, offering insights into ideal approaches to plasmonics, “perfect” absorbers, near-field “blackbodies,” Casimir forces, and more.
11:30 - 11:45 - Automated Design of Photonic Crystal Demultiplexers Oral [Show abstract]
  • Boaz Blankrot, Vienna University of Technology, Austria
  • Clemens Heitzinger, Vienna University of Technology, Austria
We describe an approach for the automated design of photonic crystals for various applications. Our approach includes gradient-based optimization for arbitrary objective functions, with the electromagnetic fields calculated by an accurate multiple-scattering approach. An example of a two-color silicon photonic crystal demultiplexer designed by our method is presented, with dozens of parameters chosen automatically in reasonable time. The optimized device exhibits strong focusing with low crosstalk for both frequencies.
11:45 - 12:00 - Limits of Laminates in Diffusive Optics Oral [Show abstract]
  • Andreas Niemeyer, Karlsruhe Institute of Technology, Germany
  • Sabine Mannherz, Karlsruhe Institute of Technology, Germany
  • Frederik Mayer, Karlsruhe Institute of Technology, Germany
  • Martin Wegener, Karlsruhe Institute of Technology (KIT), Germany
Laminates are among the most basic metamaterials. They allow for achieving anisotropy from two isotropic ingredients. Here, we study the fundamental limits of laminates for light propagation in turbid media by extensive Monte Carlo simulations. We find that large optical transmission and large effective anisotropy are not possible simultaneously.
12:00 - 12:15 - A Fiberized Metadevice for Ultrafast All-optical Signal Processing and Picosecond Dark Pulse Generation Oral [Show abstract]
  • Angelos Xomalis, University of Southampton, United Kingdom
  • Iosif Demirtzioglou, University of Southampton, United Kingdom
  • Yongmin Jung, University of Southampton, United Kingdom
  • Eric Plum, University of Southampton, United Kingdom
  • Cosimo Lacava, University of Southampton, United Kingdom
  • Perikilis Petropoulos, University of Southampton, United Kingdom
  • David Richardson, University of Southampton, United Kingdom
  • Nikolay Zheludev, University of Southampton and Nanyang Technological University, United Kingdom and Singapore
We report a fiberized metadevice for all-optical signal processing based upon coherent modulation of absorption. We demonstrate signal processing operations at data rates ranging from kbit/s up to Gbit/s, with energy consumption as low as few fJ/bit, controlled absorption and transmission of picosecond pulses and generation of 1 ps "dark pulses".
12:15 - 12:30 - The Study of Singular Metasurfaces with Transformation Optics Oral [Show abstract]
  • Fan Yang, Imperial College London, United Kingdom
  • John Pendry, Imperial College London, United Kingdom
  • Paloma Huidobro, Imperial College London, United Kingdom
The transformation optics (TO) approach is employed to study singular plasmonic metasurfaces. Being widely used in optical instruments and telescopes, it is of great significance to analytically study singular metasurfaces. This singular metasurface is transformed into an array of slabs, where the absorption by surface plasmon polaritons (SPPs) is calculated. In the metasurface frame, the absorption due to SPP is effectively modeled as a surface conductivity. Then, a flat surface model is used to calculate the reflection for the metasurface, which gives a satisfying agreement with numerical simulation.
12:30 - 14:00 - Lunch break (Thursday)
14:00 - 15:30 - Oral sessions (Thursday - afternoon 1)
14:00 - Topological effects II

Session chairperson(s): Namkyoo Park; Viktar Asadchy

14:00 - 14:15 - Group Theoretical Route to Weakly and Strongly Protected Surface States in 2D and 3D Photonic Crystals Oral [Show abstract]
  • Matthias Saba, Imperial College London, United Kingdom
  • Stephan Wong, Imperial College London, United Kingdom
  • Mathew Elman, Imperial College London, United Kingdom
  • Sang Soon Oh, Cardiff University, United Kingdom
  • Ortwin Hess, Imperial College London, United Kingdom
We introduce a group theoretical recipe towards topologically protected surface states on purely dielectric metasurfaces, and fully connected 3D photonic crystals. The predictions are verified by full wave simulations of particular designs. These can be readily realized by current direct manufacturing techniques, such as electron beam lithography and direct laser writing, respectively.
14:15 - 14:30 - Dipole Excitation of Unidirectional Edge Modes in Dielectric Photonic Topological Insulators Oral [Show abstract]
  • Sang Soon Oh, Cardiff University, United Kingdom
  • Ben Lang, University of Bristol, United Kingdom
  • Daryl Beggs, Cardiff University, United Kingdom
  • Diana Huffaker, Cardiff University, United Kingdom
  • Matthias Saba, Imperial College London, United Kingdom
  • Ortwin Hess, Imperial College London, United Kingdom
A unidirectional chiral edge mode in time-reversal symmetric topological insulators can be selectively excited by a circularly-polarized dipole source. By calculating the local chirality of an edge mode in dielectric photonic topological insulators, we show that the directionality is also strongly dependent on the position of the circularly-polarized dipole source.
14:30 - 15:00 - Crystalline Metamaterials for Topological Properties at the Subwavelength Scale Extended oral [Show abstract]
  • Simon Yves, Institut Langevin, France
  • Romain Fleury, EPFL, Switzerland
  • Thomas Berthelot, CEA Saclay, KELENN Technology, France
  • Fabrice Lemoult, Institut Langevin, France
  • Mathias Fink, Institut Langevin, France
  • Geoffroy Lerosey, Institut Langevin, France
The concept of topological insulators has recently been transposed from condensed matter to classical wave physics such as microwaves. However, these photonic topological insulators are inherently wavelength scaled because their physics rely on Bragg interferences. Here, we show experimentally how structural deformations of an electromagnetic metamaterial, although subwavelength scaled, also induce a topological phase transition.
15:00 - 15:15 - Efficient Coupling between a Circular Waveguide and Topologically Protected Unidirectional Helical Modes in Metallic Photonic Crystals Oral [Show abstract]
  • Gian Guido Gentili, Politecnico di Milano, Italy
  • Giuseppe Pelosi, University of Florence, Italy
  • Francesco Piccioli, Politecnico di Milano, Italy
  • Stefano Selleri, University of Florence, Italy
<p> A circular waveguide transition is used to selectively excite unidirectional Topologically Protected Helical Edge Modes along an interface between metallic Photonic Crystals. Return losses lower then -40dB are observed for a single port excitation and quasi-unitary transmission, mediated by the Topological interface, is observed between two circular waveguide ports for the mid-band frequency.</p>
15:15 - 15:30 - All-Dielectric Valley Photonic Crystals: Paving the Way to Topological Nanophotonics Oral [Show abstract]
  • Jianwen Dong, School of Physics & State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-Sen University, China
In this talk, I will show our recent works about realization of all-dielectric valley photonic crytals from theory to experiment, not only in microwave range but also in telecommunication wavelength. These works may open up an alternative route towards the discovery of topological nanophotonics.
14:00 - Advanced optical materials

Session chairperson(s): Pavel Ginzburg; Kevin MacDonald

14:00 - 14:15 - Magneto-optical Properties of Fibonacci-modulated Fe-Pt Multilayer Metamaterials Oral [Show abstract]
  • Satoshi Tomita, Nara Institute of Science and Technology, Japan
  • Tomomi Suwa, Nara Institute of Science and Technology, Japan
  • Patricia Riego, CIC nanoGUNE, Spain
  • Andreas Berger, CIC nanoGUNE, Spain
  • Nobuyoshi Hosoito, Nara Institute of Science and Technology, Japan
  • Hisao Yanagi, Nara Institute of Science and Technology, Japan
We investigate the magneto-optical (MO) properties of epitaxially-grown Fe-Pt periodic and quasi-periodic modulated multilayer metamaterials by means of generalized MO ellipsometry (GME) in the visible and near-infrared regions. Large Kerr rotation, ellipticity, and MO coupling parameters are obtained for the inverse-Fibonacci-modulated multilayer (IFM) metamaterials. Contrastingly, the periodic multilayers show small MO parameters although they exhibit hysteresis loops in magnetization and refractive indices in GME measurements very similar to those for IFM metamaterials.
14:15 - 14:30 - Spherulites as Natural Birefringent Metamaterials Oral [Show abstract]
  • Roman Noskov, Tel Aviv University, Israel
  • Hani Barhom, Tel Aviv University, Israel
  • Ivan Shishkin, Tel Aviv University, Israel
  • Pavel Ginzburg, Tel Aviv University, Israel
Spherulites are naturally available pours structures, which recently have got an enormous attention due to their capabilities to serve as extremely efficient biomedical cargoes in drug delivery applications. Owing to the natural crystal grows processes, those composites are made of collection of nanoscale birefringent crystals, which have nontrivial spatial orientations. Here we report on comprehensive analytical, numerical and experimental studies of vaterite microparticles and unravel their peculiar optical properties, which are significantly different from standard Mie solutions for a sphere. We analyze microparticle birefringence as a function of light wavelength and reveal that driven by different eigenmodes birefringence can change the sign and become equal to zero. Furthermore, strongly anisotropic optical properties of vaterites enable investigation of nontrivial optical forces. In particular, diverse types of rotation of optically trapped vaterites will be demonstrated. Flexible optomechanical manipulation together with superior load capacities of Spherulites make them attractive to drug delivery applications.
14:30 - 14:45 - Linear and Circular Dichroism in Gyroid Optical Metamaterials Oral [Show abstract]
  • Cédric Kilchoer, Adolphe Merkle Institute, University of Fribourg, Switzerland
  • James A. Dolan, University of Chicago, United States
  • Matthias Saba, Imperial College, United Kingdom
  • Narjes Abdollahi, Adolphe Merkle Institute, University of Fribourg, Switzerland
  • Karolina Korzeb, Adolphe Merkle Institute, University of Fribourg, Switzerland
  • Ulrich Wiesner, Cornell University, United States
  • Ullrich Steiner, Adolphe Merkle Institute, University of Fribourg, Switzerland
  • Ilja Gunkel, Adolphe Merkle Institute, University of Fribourg, Switzerland
  • Bodo D. Wilts, Adolphe Merkle Institute, University of Fribourg, Switzerland
Gyroid optical metamaterials with unit cell sizes of tens of nanometers are fabricated via electrodeposition of gold into voided polymer template. We show that reflected light from gold gyroids is strongly polarization-dependent, and sensitive to the handedness of the gyroid and the terminations of its top surface.
14:45 - 15:00 - Top-down Fabrication of Barium Titanate Metasurfaces with Transmission Filtering in the Visible Oral [Show abstract]
  • Flavia Timpu, ETH Zürich, Switzerland
  • Marc Reig Escalé, ETH Zürich, Switzerland
  • Adrien Merkt, ETH Zürich, Switzerland
  • Lukas Lang, ETH Zürich, Switzerland
  • Mariia Timofeeva, ETH Zürich, Switzerland
  • Rachel Grange, ETH Zürich, Switzerland
We use thin films of barium titanate (BaTiO3), a perovskite ferroelectric material, to fabricate nonlinear metasurfaces. This enables us to add the bulk nonlinearity from a noncentrosymmetric material as an additional property to the versatility and tunability of metasurfaces. We demonstrate a tunable variation of the transmittance in the 400-600 nm range by variation of the pitch and the radius of the perovskite nanostructures.
15:00 - 15:30 - Extraordinary Properties of Chalcogenide Metamaterials Invited oral [Show abstract]
  • Kevin MacDonald, Univesity of Southampton, United Kingdom
  • Davide Piccinotti, Univesity of Southampton, United Kingdom
  • Artemios Karvounis, Univesity of Southampton, United Kingdom
  • Behrad Gholipoour, Univesity of Southampton, United Kingdom
  • Jin Yao, Univesity of Southampton, United Kingdom
  • Brian Hayden, Univesity of Southampton, United Kingdom
  • Nikolay Zheludev, Univesity of Southampton, United Kingdom
Fascinating opportunities are offered by metamaterial nanostructures fabricated from materials with highly-dispersive optical properties, between those of ideally plasmonic (e.g. noble metal) and transparent dielectric media. Chalcogenide semiconductors are excellent examples – their optical properties can be engineered by controlling alloy composition and phase state to provide high and low refractive indices, plasmonic, dielectric and epsilon-near-zero characteristics at near-ultraviolet to near-infrared wavelengths. We report here on the application of chalcogenide materials to photonic metasurfaces.
14:00 - Applications to energy, sensing and optical trapping

Session chairperson(s): Alireza Rahimi Rashed; Mohammad Sajjad Mirmoosa

14:00 - 14:15 - Gap-Free Super-Planckian Thermophotovoltaics Oral [Show abstract]
  • Mohammad Sajjad Mirmoosa, Aalto University, Finland
  • Svend-Age Biehs, Oldenburg University, Germany
  • Constantin Simovski, Aalto University, Finland
The concept of a thermophotovoltaic system whose emitter is separated from the photovoltaic cell by an intermediate thick slab of gallium arsenide is introduced. Due to the engineered structure of the emitter (a multilayer structure of negative and positive-epsilon layers) together with a high refraction index and transparency of the intermediate slab, we achieve a super-Planckian and frequency-selective spectrum of radiative heat transfer which is desirable for the efficient performance of thermophotovoltaic systems. While the thermal power transported from the emitter towards the photovoltaic cell by the heat conduction is not zero anymore due to the presence of the intermediate slab, we show that it is less than the transferred radiative thermal power and it can be evacuated by a water-cooling system.
14:15 - 14:30 - Front-Electrode Design For Efficient Near-Field ThermoPhotoVoltaics Oral [Show abstract]
  • Aristeidis Karalis, MIT, USA
  • John Joannopoulos, MIT, USA
Detailed design guidelines and optimization results are presented for front electrodes in efficient resonant near-field thin-film TPV cells, including novel near-field effects, a comparison of different transparent conducting materials and metal-grid-finger considerations.
14:30 - 14:45 - Insights into Broadband Backscattering Suppression in Solar Cells from the Duality Point of View Oral [Show abstract]
  • Evgeniia Slivina, Karlsruhe Institute of Technology, Germany
  • Aimi Abass, Karlsruhe Institute of Technology, Germany
  • Ivan Fernandez-Corbaton, Karlsruhe Institute of Technology, Germany
  • Derk Bätzner, Meyer Burger Research AG, Switzerland
  • Carsten Rockstuhl , Karlsruhe Institute of Technology, Germany
Employing high index dielectric cylindrical nanoparticle arrays has been shown to provide strong broadband suppression of reflection in solar cells when their geometry is properly tailored. The physical mechanism behind this effect, however, is not well understood, with most attributing it only to the silicon wafer's higher density of states due to its index. Here, we discuss the phenomena from the stand point of duality, which is the condition where the magnetic and electric response of the system are equal. We consider an optimized electrically decoupled sub-micron cylinder array, which provides reflection below 5% in the spectral region where the solar cell is highly absorptive. We show that spectral regimes corresponding to high reflection in our optimized solar cell structure are essentially regimes where one is significantly far from the duality condition for the entire sample. We further show that anti-reflective performance of a cell can be improved even more for a system with a higher degree of symmetry.
14:45 - 15:00 - Highly Sensitive Near-Infrared Refractive Index Sensor by Metatronic Nanocircuits Oral [Show abstract]
  • Alireza Rahimi Rashed, Tampere University of Technology, Finland
  • Basak Gudulluoglu, Hacettepe University, Ankara, Turkey
  • Hye-Won Yun, Electronics and Telecommunication Research Institute, Republic of Korea
  • Mohsin Habib, Bilkent University, Turkey
  • Ismail Hakki Boyaci, Hacettepe University, Turkey
  • Ekmel Ozbay, Bilkent University, Turkey
  • Humeyra Caglayan, Tampere University of Technology, Finland
In this work, we present a highly-sensitive refractive index nano-sensor based on metatronic nanocircuits operating at near-infrared spectral range. The structure is designed based on simple nanorod geometry and fabricated by nanopatterning of transparent conducting oxides. The sensing feature of these polarization dependent metatronic nanocircuits is investigated by depositing NH2 (Amine) groups via plasma polymerization technique above them. We show that the dielectric constant of Amine groups can be controlled by changing their thicknesses, as the RF power or time duration of the applied plasma polymerization process changes. The resonance wavelengths of nanocircuits shift to higher wavelength, as the dielectric constant of the deposited material increases. Our nano-sensor offers a high-sensitive performance of 1587 nm/RIU with a satisfactory figure of merit for this class of sensors.
15:00 - 15:15 - Interaction Forces of Electric Currents and Charges in a Double DNA-like Helix and its Equilibrium Oral [Show abstract]
  • Igor Semchenko, Francisk Skorina Gomel State University, Belarus
  • Sergei Khakhomov, Francisk Skorina Gomel State University, Belarus
  • Alexei Balmakou, Francisk Skorina Gomel State University, Belarus
  • Ivan Mikhalka, Francisk Skorina Gomel State University, Belarus
The interaction of currents and charges in two helices is considered when a standing low-frequency electromagnetic wave arises in a double DNA-like helix. The mutual displacement of the two helices along their common axis is taken into account. It is shown that it leads to the simultaneous existence of force and moment of force acting on each helix and directed along their common axis. Radial components of the forces of currents and charges interaction are also considered depending on the pitch angle of the double helix.
15:15 - 15:30 - Metamaterial Substrates for Optical Pulling Forces Oral [Show abstract]
  • A. Ivinskaya, ITMO University, Russia
  • N. Kostina, ITMO University, Russia
  • M.I. Petrov, ITMO University, Russia
  • A.A. Bogdanov, ITMO University, Russia
  • S. Sukhov, University of Central Florida, USA
  • P. Ginzburg, Tel Aviv University, Israel
  • Alexander Shalin, ITMO University, Russia
The optical force acting on a nanoparticle near a planar substrate is governed by incident light and excitation of surface and volume modes of the substrate. We study system configurations leading to significant enhancement of optical forces, for example, plane wave results in pulling forces towards the source for certain types of anisotropic substrates.
14:00 - Scattering control and cloaking

Session chairperson(s): Alvar Sanchez; Do-Hoon Kwon

14:00 - 14:15 - Lossless Tensor Surface Invisibility Cloaks Utilizing Surface Waves Oral [Show abstract]
  • Do-Hoon Kwon, University of Massachusetts Amherst, USA
A design technique for lossless surface invisibility cloaks for free-space objects using surface waves is presented. The bounding surface of a cloaked region can be designed to transform and guide the illuminating plane wave around and along the surface as surface waves. The proposed designs are promising for realization as ultra-thin metasurface cloaks for electrically large objects in free space.
14:15 - 14:30 - Design and Experiment of Multifrequency Free-Space Invisibility Cloak for Electrically-Large Objects Oral [Show abstract]
  • Yongjune Kim, Center for Advanced Meta-Materials, South Korea
  • Tianwei Deng, National University of Singapore, Singapore
  • Wei Xiang Jiang, Southeast University, P. R. China
  • Tie Jun Cui, Southeast University, P. R. China
  • Boyoung Kang, Center for Advanced Meta-Materials, South Korea
  • Hak-Joo Lee, Center for Advanced Meta-Materials, South Korea
  • Yongshik Lee, Yonsei University, South Korea
  • Cheng-Wei Qiu, National University of Singapore, Singapore
A design method is proposed for optimizing an isotropic medium to enable the multifrequency cloaking for an electrically-large object isolated in free space. First, refractive indices calculated by the quasi-conformal mapping (QCM) technique are sectionalized based on the anisotropy factors. Second, approximated isotropic refractive indices of the sections are scaled optimally to minimize the scattering width (SW) of a diamond object not only by collimating the path of the scattered wave but also by inducing harmonics of 2π phase delay. The cloaking performance is verified with 82.6% reduction of scattering width (SW) at the design frequency 15 GHz based on the full-wave simulation. In addition, 62% and 73.4% SW reductions are confirmed at 5.2 and 2.3 GHz, respectively, in descending order. The proposed method is validated experimentally by the reduced electromagnetic scattering of a double-cone copper at the multiple frequencies.
14:30 - 15:00 - Inverse Scattering as a Way to Artificial Dielectric Based Metamaterials Invited oral [Show abstract]
  • Tommaso Isernia, Univ. Mediterranea di Reggio Calabria, Italy
  • Roberta Palmeri, Univ. Mediterranea di Reggio Calabria, Italy
Inverse scattering is proposed to design artificial dielectrics-based devices. In particular, a representation basis for the unknown contrast allowing the determination of the value of the inclusions is used. Then, simple analytical arguments are given in order to exploit a filling factor shaping rather than different materials.
15:00 - 15:15 - Dissipation-inspired Asymmetric Scattering and Reflection Oral [Show abstract]
  • Dmitry Filonov, Tel Aviv University, Israel
  • Vitali Kozlov, Tel Aviv University, Israel
  • Pavel Ginzburg, Tel Aviv University, Israel
The optical theorem, being the manifestation of the energy conservation law, relates the total scattering cross-section with the forward scattering of a structure, but does not impose any restrictions on other directions. Strong asymmetric reflection and back scattering can be achieved in structures with magneto-electric coupling between constitutive elements. Here the scattering properties of single meta-particles, based on near-field coupled electric and magnetic dipoles, and their arrays are analyzed. In particular, it is shown that the dissipation is the key mechanism, responsible for the asymmetric backscattering behavior. While far-field scattering can serve as a sufficient loss mechanism in the case of single structures, Joule dissipation should be added in the case of periodic metasurfaces. In this case, the practical realization is based on split ring resonators, loaded with a resistance, and wires, both printed on a PC board. Theoretical predictions of the phenomena are supported by both numerical and experimental confirmations, obtained at the GHz frequency range, and all are in a good agreement with each other.
15:15 - 15:30 - Undetectable Magnetic Sensors Oral [Show abstract]
  • Rosa Mach-Batlle, Universitat Autonoma de Barcelona, Spain
  • Alvaro Sanchez, Universitat Autonoma de Barcelona, Spain
Magnetic sensors play an essential role in many technologies. Because most magnetic sensors include ferromagnetic materials, which attract magnetic field lines, they inherently distort the probing field. This may be an issue, particularly when accurate magnetic field distributions are required. Here we show how magnetic sensors can be made undetectable by surrounding them with a spherical shell with homogeneous isotropic permeability. The sensor is not isolated from its surroundings and, thus, it is still able to sense. Results may be useful for applications requiring non-invasive sensing.
15:30 - 16:00 - Coffee break (Thursday afternoon) - Meet-and-greet the Physical Review Editors
16:00 - 18:00 - Oral sessions (Thursday - afternoon 2)
16:00 - Special session: Nanogap plasmonics and devices

Organizer(s): Cristian Ciraci; David Smith; Antoine Moreau

Session chairperson(s): David Smith; Antoine Moreau; Cristian Ciraci

16:00 - 16:30 - Light-Forbidden Transitions in Plasmon-Emitter Coupling Invited oral [Show abstract]
  • Antonio Fernández Domínguez, Universidad Autónoma de Madrid, Spain
In this talk, we will investigate the impact that light-forbidden exciton transitions have in the near-field population dynamics and far-field scattering spectrum of hybrid plasmon-emitter systems. Specifically, we will consider a V-type quantum emitter sustaining one dipolar and one quadrupolar (dipole-inactive) excited states, placed at the nanometric gap of a particle-on-a-mirror metallic cavity. A fully analytical description of plasmon-exciton coupling based on Transformation Optics will be presented for both exciton transitions. Using this theoretical approach, we will reveal the conditions in which the presence of the light-forbidden exciton alters greatly the Purcell enhancement and Rabi splitting phenomenology in the system.
16:30 - 17:00 - Gap-Plasmon Based Metasurfaces with Diversified Functionalities Invited oral [Show abstract]
  • Sergey Bozhevolnyi, University of Southern Denmark, Denmark
Integration of multiple diversified functionalities into a single metasurface has recently attracted a considerable attention due to fascinating possibilities for realization of very dense integration and miniaturization in photonics. In this talk, I overview our latest achievements in this area using gap-plasmon based phase-gradient metasurfaces operating in reflection geometry.
17:00 - 17:15 - Using Optical Nanocavities to Improve Devices Invited (15 minutes) [Show abstract]
  • Giuliana DI Martino, University of Cambridge, United Kingdom
Trapping light with noble metal nanostructures overcomes the diffraction limit and can confine light to volumes typically on the order of 30 cubic nanometers. Individual atomic features inside the gap of a plasmonic nanoassembly can localize light to volumes well below 1 cubic nanometer, enabling optical experiments on the atomic scale [Science 354, 726 (2016)]. Fabricating nanocavities in which optically active single quantum emitters are precisely positioned is crucial for building nanophotonic devices [Nano Lett. 18, 405 (2018)]. Photon emitters placed in an optical cavity experience an environment that changes how they are coupled to the surrounding light field [Nature 535, 127 (2016)]. Plasmonic mode hybridization between tightly confined plasmonic cavity modes and a radiative antenna mode sustained in the optical nanocavities shows how optics can reveal the properties of electrical transport across well-defined metallic nanogaps to study and develop innovative technologies [Nano Lett. 16, 5605 (2016)]. One of the most promising contenders for ultralow-energy electronic devices is resistive switching memory (RRAM) which delivers sustainably-scalable ‘neuromorphic’ computing, potentially capable of reducing energy consumption in IT by >50%. Understanding the nanoscale kinetics of the switching mechanisms is needed to enable high-endurance devices – only this can unlock their integration into fast, low-energy, logic-in-memory architectures. RRAMs are currently studied by electron microscopy however this is destructive, invasive, and under drastically different conditions, so is not sufficient for developing true understandings. Using the ultra-concentration of light we recently achieved [Small 12, 1334 (2016)], we develop innovative fast ways to study real-time movement of individual atoms that underpins this new generation of ultra-low energy memory nano-devices, thus overcoming the limitations of traditional investigation techniques and opening up new routes to sustainable future IT.
17:15 - 17:30 - Gap Plasmons Explored with Electron Energy-loss Spectroscopy Invited (15 minutes) [Show abstract]
  • Søren Raza, Technical University of Denmark, Denmark
<p> In this talk, I will present two recent works on gap surface plasmons (GSPs). The first work focuses on GSPs propagating in very narrow silver slits, which have potential for integrated optical circuits. Here, we use electron energy-loss spectroscopy (EELS) to experimentally show the propagation, bending, and splitting of GSPs. The second work relates to GSPs localized in between two gold nanoparticles. By preparing the gold dimer on a microelectromechanical system, we can actively control the gap between the nanoparticles through electrical actuation. This allows us to control the optical response of the dimer, which we measure with in situ EELS -- a new technique for characterizing optical devices.</p>
17:30 - 18:00 - Nanogap Plasmonics: Dynamic Tuning, Perfect Absorbers and Photodetection Invited oral [Show abstract]
  • Maiken Mikkelsen, Duke University, USA
Plasmonic film-coupled nanocubes are used to demonstrate large-area perfect absorbers, pixel arrays and ~10,000 combinatorial colors. Integrating either optically or electrically tunable materials in a ~10 nm gap between the metallic film and silver nanocubes enables broad dynamic tuning of the plasmon resonance.
16:00 - Nonreciprocal metamaterials

Session chairperson(s): Jordi Prat Camps; Andrea Alu

16:00 - 16:30 - Slow Light and Nonreciprocity in Metamaterials Invited oral [Show abstract]
  • Andrea Alu, Advanced Science Research Center, CUNY, USA
In this talk, we discuss our recent results in the area of nonreciprocal devices based on magnetic bias, temporal modulations, nonlinearities and mechanical motion, with a focus on their potential impact in the context of slow light propagation and the delay bandwidth limit. First, we show that, different from recent claims presented in the literature, there are fundamental bounds and relations on the bandwidth and time delay that can be imparted on a given signal by nonreciprocal cavities. They obey bounds consistent with reciprocal cavities, and as such nonreciprocity is not necessarily advantageous in the context of the delay bandwidth limit. Then, we propose a class of spatiotemporally modulated systems, which, under specific conditions, can operate as broadband delay lines exhibiting no group velocity dispersion. Such networks can serve as a platform to achieve slow light over a small footprint, ideal in the quest to realizing integrated, deeply subwavelength photonic topological insulators.
16:30 - 16:45 - Dynamic Nonreciprocity in Piezophononic Media Oral [Show abstract]
  • Aurélien Merkel, Universidad Carlos III de Madrid, Spain
  • Morten Willatzen, Beijing Institute of Nanoenergy and Nanosystems, Beijing, China
  • Johan Christensen, Universidad Carlos III de Madrid, Spain
In this work, nonreciprocal propagation of acoustic waves in piezoelectric semiconductors is demonstrated. By taking advantage of the acoustoelectric effect, we demonstrate a nonreciprocal linear isolator for acoustic waves in elastic solids of large bandwidth, high contrast ratio and high power transmission efficiency in the passing direction.
16:45 - 17:00 - Unusual Electromagnetic Modes based on Codirectional Coupled Space-time Harmonics Oral [Show abstract]
  • Nima Chamanara, Ecole Polytechnique de Montreal, Canada
  • Zoé-Lise Deck-léger, Polytechnique Montreal, Canada
  • Christophe Caloz, Polytechnique Montreal, Canada
This paper introduces new electromagnetic modes generated in space-time modulated dispersion engineered media. These modes are produced by intercoupling between codirectional space-time harmonics. They exhibit peculiar properties such as periodic transfer of energy between their constituent space-time harmonics and exponential growth. They may find applications in low-noise amplifiers and perfect mixers.
17:00 - 17:15 - Nonlinear Isolators and Circulators Based on Networks of Coupled Resonators Oral [Show abstract]
  • Dimitrios Sounas, The University of Texas at Austin, USA
  • Jason Soric, The University of Texas at Austin, USA
  • Giuseppe D' Aguanno, The University of Texas at Austin, USA
  • Andrea Alu, City University of New York, USA
We present our recent results in the area of nonlinear nonreciprocal devices, including isolators and circulators. We show that the nonlinear isolators based on single Fano resonators are subject to a fundamental trade-off between transmission and isolation intensity range or bandwidth, stemming from time reversal symmetry. We also show how we can overcome this limitation by using multiple nonlinear resonators. Finally, we show that networks with many nonlinear resonators can also be used to realize more advanced devices, such as circulators.
17:15 - 17:30 - Asymmetric Cherenkov Emission in a Graphene Sheet with a Drift-Current Oral [Show abstract]
  • Filipa Prudêncio, University of Lisbon - Instituto de Telecomunicacoes, Portugal
  • Mário Silveirinha, University of Lisbon - Instituto de Telecomunicacoes, Portugal
We study the impact of the nonreciprocal response of a graphene sheet with an electric current bias in the context of the Cherenkov problem. The drift bias enables strongly asymmetry Cherenkov emissions with spectrum dependent on the sign of the charges velocity.
17:30 - 18:00 - Circumventing Magnetic Reciprocity: a Diode for Magnetic Fields Extended oral [Show abstract]
  • Jordi Prat-Camps, University of Sussex, United Kingdom
  • Patrick Maurer, IQOQI - UIBK, Austria
  • Gerhard Kirchmair, IQOQI - UIBK, Austria
  • Oriol Romero-Isart, IQOQI - UIBK, Austria
Lorentz reciprocity establishes a stringent relation between electromagnetic fields and their sources. For static magnetic fields, a relation between magnetic sources and fields can be drawn in analogy to the Green’s reciprocity principle for electrostatics. Here we theoretically and experimentally show that a linear and isotropic electrically conductive material moving with constant velocity is able to circumvent the magnetic reciprocity principle and realize a diode for magnetic fields. This result is demonstrated by measuring an extremely asymmetric magnetic coupling between two coils that are located near a moving conductor. The possibility to generate controlled unidirectional magnetic couplings breaks down one of the most deeply-established relations in classical electromagnetism, namely that mutual inductances are symmetric.
16:00 - Metasurfaces II

Session chairperson(s): Anthony Grbic; Ariel Epstein

16:00 - 16:15 - A Fundamental Speed Limit For Optomechanical Metasurfaces Oral [Show abstract]
  • Sophie Viaene, Vrije Universiteit Brussel, Belgium
  • Vincent Ginis, Harvard University, USA
  • Jan Danckaert, Vrije Universiteit Brussel, Belgium
  • Philippe Tassin, Chalmers University of Technology, Sweden
We show that switching speeds of optomechanical metasurfaces are limited by their nonlinear response to an external pump beam, which is demonstrated by solving for the transient dynamics of unit cells under influence of a pump-induced force or torque.
16:15 - 16:30 - Surface Topology Specific Metasurfaces Oral [Show abstract]
  • James Burch, University of St Andrews, United Kingdom
  • Andrea Di Falco, University of St Andrews, United Kingdom
In this work we extend holographic metasurfaces from flat to arbitrary substrates. We show that the substrate topology can be exploited to control the holograms, with applications in security printing and topology sensors.
16:30 - 16:45 - An Alternative to Huygens' Meta-Atoms: Transmitarray with Only Electric Response Oral [Show abstract]
  • Grigorii Ptitcyn, Aalto University, Finland
  • Ana Diaz-Rubio, Aalto University, Finland
  • Sergei Tretyakov, Aalto University, Finland
We explored ways of obtaining the functionality of Huygens' meta-atoms without the use of magnetic response. We show that this approach is beneficial considering frequency bandwidth and the inclusions size. Finally, we present a design of an optical transmitarray that bends normally incident waves.
16:45 - 17:00 - Broadband-Reflectionless Perfect Absorber Made of Planar Resonators Oral [Show abstract]
  • Juan P. del Risco, Universidad Sergio Arboleda, Colombia
  • Manuel A. Londoño, Universidad Nacional de Colombia, Colombia
  • Andrey Sayanskiy, ITMO University, Russia
  • Stanislav B. Glybovski, ITMO University, Russia
  • Juan D. Baena, Universidad Nacional de Colombia , Colombia
In this work we have numerically designed a metasurface with narrowband perfect absorption and broadband low reflection. The unit cell is formed by couple of split ring resonators. We have developed two theoretical models, one for the transmission/reflection coefficients of the metasurface and a second describing the basic mechanism of the unit cell.
17:00 - 17:15 - Achieving Anomalous Refraction with Metasurfaces Composed by Two Ordinary Dielectric Materials Oral [Show abstract]
  • Nikolaos Tsitsas, Aristotle University of Thessaloniki, Greece
  • Constantinos Valagiannopoulos, Nazarbayev University, Kazakhstan
The optimal parameters of a dielectric metasurface, composed of two alternating rectangular rods, are investigated so that it exhibits significant enhancement in the -1 diffracted order in the transmission region. An efficient integral-equation methodology is used for the numerical computations. Representative results of initial optimizations are presented.
17:15 - 17:30 - Ultrafast Optical Pulse Shaping using Dielectric Metasurfaces Oral [Show abstract]
  • Amit Agrawal, CNST, NIST, USA
  • Shawn Divitt, CNST, NIST, USA
  • Wenqi Zhu, CNST, NIST, USA
  • Cheng Zhang, CNST, NIST, USA
  • Henri Lezec, CNST, NIST, USA
Arbitrary control over the amplitude, phase and polarization of individual spectral lines in an ultrafast optical pulse forms an integral part of the field of ultrafast science, and compliments pulse generation and characterization methods. Here, we experimentally demonstrate shaping of ultrabroadband sub-15 fsec ultrafast laser pulses using a silicon-metasurface acting as both the spectral amplitude and phase mask.
17:30 - 17:45 - Stacked Metasurface Slab Oral [Show abstract]
  • Nima Chamanara, Polytechnique Montreal, Canada
  • Yousef Vahabzadeh, Polytechnique Montreal, Canada
  • Christophe Caloz, Polytechnique Montreal, Canada
This paper presents "stacked metasurface slabs", stacked array of cascaded metasurfaces synthesized using a GSTC-based algorithm that circumvent fabrication difficulties in metasurfaces involving sharply varying field transformations. The specified transformation is subdivided into several smoother transformations and shared between cascaded bianisotropic metasurfaces. This algorithm relaxes the fabrication requirements dramatically.
17:45 - 18:00 - Detecting Coherence of Light with Metasurfaces Oral [Show abstract]
  • Vassili Fedotov, University of Southampton, United Kingdom
  • Tom Frank, University of Southampton, United Kingdom
  • Oleksandr Buchnev, University of Southampton, United Kingdom
  • Tamsin Cookson, University of Southampton, United Kingdom
  • Malgosia Kaczmarek, University of Southampton, United Kingdom
  • Pavlos Lagoudakis, University of Southampton, United Kingdom
We report on a recent discovery that metasurfaces of a certain class respond differently to coherent and incoherent light, enabling robust discrimination between these two states of radiation. The effect has no direct analogue in conventional optics and may find application in compact metadevices enhancing imaging, vision, detection, communication and metrology.
16:00 - Theory and modeling III

Session chairperson(s): Jonathan Gratus; Tsuyoshi Ueta

16:00 - 16:15 - Artificial Localized Magnon Resonance for Super Scattering Applications Oral [Show abstract]
  • Dmitry Filonov, Tel Aviv University, Israel
  • Hani Barhom, Tel Aviv University, Israel
  • Andrey Shmidt, Tel Aviv University, Israel
  • Amir Boag, Tel Aviv University, Israel
  • Pavel Ginzburg, Tel Aviv University, Israel
<p> The concept of metamaterials enable considering material degree of freedom as a design parameter in a range of electromagnetic applications. In particular, subwavelength structures made of materials with negative susceptibilities can exhibit strong resonant behaviors. Here the concept of artificial magnon resonance in subwavelength objects with effective negative permeability is demonstrated theoretically, numerically and experimentally. Strongly localized oscillations of the magnetic fields within an array of SRRs, forming a sphere, hybridize in a collective mode of the structure. As a result, extremely high scattering cross section, exceeding that of a steel sphere with the same radius by four orders of magnitude. From the application standpoint, the demonstrated supper scatterer has VHF radar signature, prevailing the one of a big military aircraft.</p>
16:15 - 16:30 - Nonlocal Homogenization Theory for Centro-Symmetric Optical Metamaterials Oral [Show abstract]
  • Karim Mnasri, Karlsruhe Institute of Technology, Germany
  • Andrii Khrabustovskyi, Karlsruhe Institute of Technology, Germany
  • Christian Stohrer, Karlsruhe Institute of Technology, Germany
  • Michael Plum, Karlsruhe Institute of Technology, Germany
  • Carsten Rockstuhl, Karlsruhe Institute of Technology, Germany
The introduction of effective material parameters is of paramount importance to predict observable features from actual metamaterials. Frequently, only local material properties, i.e. permittivity and permeability for a centro-symmetric metamaterial, are considered. However, when the period-to-wavelength ratio tends to be rather large, this assumption is insufficient. Here, we overcome this issue by introducing effective properties of metamaterials with constitutive relations beyond a local response. We study bulk properties of metamaterials in terms of the dispersion relation of the eigenmodes and reflection and transmission from a slab of finite thickness. We demonstrate the importance of the introduction of advanced material properties to capture the properties of the metamaterial when compared to a local description.
16:30 - 16:45 - Optical Emission and Light Propagation in Spatially Dispersive Metamaterial Structures Oral [Show abstract]
  • Markus Nyman, Aalto University, Finland
  • Ville Kivijärvi, Aalto University, Finland
  • Andriy Shevchenko, Aalto University, Finland
  • Matti Kaivola, Aalto University, Finland
We describe advanced methods to design anisotropic and spatially dispersive optical metamaterials for controlling propagation and radiation of light. Our methods allow one to use remarkably accurate semi-analytical calculations that make it possible to consider the interaction of light with large metamaterial structures.
16:45 - 17:00 - Spatial Dispersion: From the Ground Up Oral [Show abstract]
  • Paul Kinsler, Lancaster University, United Kingdom
  • Jonathan Gratus, Lancaster University, United Kingdom
By examining simple transfer matrix and scatterer models that provide analytically and numerically solvable systems, we see how spatially dispersive properties emerge in the many unit-cell limit.
17:00 - 17:30 - Predicting Observable Quantities of Self-Assembled Metamaterials from the T-Matrix of Its Constituting Meta-Atoms Extended oral [Show abstract]
  • Radius Suryadharma, Karlsruhe Institute of Technology, Germany
  • Carsten Rockstuhl, Karlsruhe Institute of Technology, Germany
Self-assembly processes attract a great amount of interest from the research community because of their ability to enable metamaterials with isotropic properties, in large quantities, and at relatively low cost. For such class of metamaterials, the bulk optical response can be deduced from the response of its individual constituent, i.e. the meta-atoms. It usually requires to calculate the average response of an individual meta-atom from many illumination directions that cover the entire 4π-solid angle. This approach, however, is time consuming and requires a lot of computational efforts. Here, we demonstrate that several experimentally observable parameters, such as many different cross sections, can be deduced directly from the T-matrix of the individual meta-atom. This method allows to extract experimental parameters directly in an efficient manner without averaging the response manually.
17:30 - 17:45 - Modular Approach to Understanding and Synthesis of Metamaterials and Metasurfaces Oral [Show abstract]
  • Viktar Asadchy, Aalto University, Finland
  • Sergei Tretyakov, Aalto University, Finland
The vast majority of previously proposed metamaterials and metasurfaces are anisotropic or bianisotropic (exhibiting magnetoelectric coupling). Nevertheless, their anisotropy was not fully exploited as they were designed only for one or several specific illumination directions. In this talk, we propose a simple analytical approach to characterize properties of general bianisotropic meta-atoms for an arbitrary illumination. The approach is based on the qualitative decomposition of an arbitrary meta-atom into separate basic "modules" with elementary polarization properties. Such decomposition can be used for comprehensive characterization of previously designed structures as well as for synthesizing novel bianisotropic inclusions of arbitrary complexity and with desired response.
17:45 - 18:00 - Resonance with Virtual Bound States and Amplification within a Vibrating 1D Photonic Crystal Oral [Show abstract]
  • Tsuyoshi Ueta, The Jikei University School of Medicine, Japan
Within an artificially vibrating one-dimensional metallic photonic crystal, the lattice vibration amplifies the incident wave resonantly. In the present study, it has been confirmed that the amplification of an incident EM field is caused by resonance with the virtual bound states.
18:00 - 18:30 - Closing ceremony

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