Wood Anomalies and Surface-Wave Excitation with a Time Grating

Galiffi, Emanuele; Wang, Yao‐Ting; Lim, Zhen Zong; Pendry, J. B.; Alù, Andrea; Huidobro, Paloma A.

doi:10.1103/physrevlett.125.127403

Cited by 75 publications

(40 citation statements)

References 42 publications

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“…Interestingly, time-modulated surfaces enable sharply different wave dynamics due the fact that the light cone treats time on a different footing that any of the spatial dimensions: if we consider light impinging on a flat, time-modulated surface, its in-plane momentum k x will now be conserved, whereas k z and, importantly the wave frequency ω, are now allowed to change. Taking a vertical cut of the light cone for a fixed value of k x , we see that the two quantities being traded by the surface, k z and ω must not add, but rather subtract 95 Figures adapted from. 94,95 in quadrature.…”

Section: Time-modulated Surfacesmentioning

confidence: 99%

“…Taking a vertical cut of the light cone for a fixed value of k x , we see that the two quantities being traded by the surface, k z and ω must not add, but rather subtract 95 Figures adapted from. 94,95 in quadrature. As a result, the locus of points described by the available modes in the far-field is no longer elliptical, but hyperbolic.…”

Section: Time-modulated Surfacesmentioning

confidence: 99%

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Photonics of Time-Varying Media

Galiffi,

Tirole,

Yin

et al. 2021

Preprint

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Time-varying media have recently emerged as a new paradigm for wave manipulation, thanks to the synergy between the discovery of novel, highly nonlinear materials, such as epsilon-near-zero materials, and the quest for novel wave applications, such as magnet-free nonreciprocity, multi-mode light shaping, and ultrafast switching. In this review we provide a comprehensive discussion of the recent progress achieved with photonic metamaterials whose properties stem from their modulation in time. We review the basic concepts underpinning temporal switching and its relation with spatial scattering, and deploy the resulting insight to review photonic time-crystals and their emergent research avenues such as topological and non-Hermitian physics. We then extend our discussion to account for spatiotemporal modulation and its applications to nonreciprocity, synthetic motion, giant anisotropy, amplification and other effects. Finally, we conclude with a review of the most attractive experimental avenues recently demonstrated, and provide a few perspectives on emerging trends for future implementations of time-modulation in photonics.

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Section: Time-modulated Surfacesmentioning

confidence: 99%

Section: Time-modulated Surfacesmentioning

confidence: 99%

Photonics of Time-Varying Media

Galiffi,

Tirole,

Yin

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

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“…One may also electrostatically modulate the permittivity of atomically thin material, which is effectively behave as an infinitely thin sheet with a conductivity [207] Recently, in the plasmonics community, they showed that graphene could be electrically modulated at a very high frequency around terahertz to have multi functionalities such as a broadband absorber in the terahertz range, a high-efficiency plasmonic coupler and an atomically thin lens with a tunable focal length [165,208,209].…”

Section: Chaptermentioning

confidence: 99%

Dynamical metasurfaces: electromagnetic properties and instabilities

Oue¹

2021

Preprint

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In this thesis, I analyse the electromagnetic properties of dynamical metasurfaces and find two critical phenomena. The first is the Casimir-induced instability of a deformable metallic film.In general, two charge-neutral interfaces attract with or repel each other due to the contribution from the zero-point fluctuation of the electromagnetic field between them, namely, the Casimir effect. The effects of perturbative interface corrugation on the Casimir energy in the film system is studied by the proximity force approximation with dispersion correction. If the corrugation period exceeds a critical value, the Casimir effect dominates the surface tension and brings about structural instability. The second is Čerebkov radiation in the vacuum from a timevarying, corrugated surface. Travelling faster than light brings about electromagnetic shockThe copyright of this thesis rests with the author. Unless otherwise indicated, its contents are licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International Licence (CC BY NC-SA).

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“…In addition to these impressive phenomena, various types of dualities between temporal and spatial modulations have * grebenchukov_a@mail.ru been demonstrated, such as antireflection temporal coatings [22], the temporal Brewster angle [23], temporal beam steering [24], and the temporal counterpart of the Wood anomaly [25].…”

Section: Introductionmentioning

confidence: 99%

Temporally modulated metamaterial based on a multilayer graphene structure

Masyukov

Grebenchukov²

2021

Phys. Rev. B

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The recently developed concept of time-varying metamaterials paves the way for advanced methods of electromagnetic property modulation, such as magnet-free isolators, frequency converters, and other nonreciprocal photonic components. Here, we analyze the metamaterial based on the periodically arranged temporally modulated graphene layers via a steplike graphene Fermi level. The material properties are described by the effective medium theory. The electromagnetic wave temporal scattering phenomenon caused by rapid steplike graphene Fermi level switching is considered. It is demonstrated that the frequency of scattered waves increases as the Fermi level grows rapidly and vice versa. The relation between the amplitudes of forward-and backward-scattered waves is found using the Laplace transform technique. The proposed concept allows us to efficiently generate frequency harmonics under instant switching of the graphene Fermi level at a few meV. Our investigation provides a basement for the realization of temporally modulated multilayer structures based on functional tunable materials as power-efficient frequency converters.

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Wood Anomalies and Surface-Wave Excitation with a Time Grating

Cited by 75 publications

References 42 publications

Photonics of Time-Varying Media

Photonics of Time-Varying Media

Dynamical metasurfaces: electromagnetic properties and instabilities

Temporally modulated metamaterial based on a multilayer graphene structure

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