Temporal switching to extend the bandwidth of thin absorbers

Li, Huanan; Alù, Andrea

doi:10.1364/optica.408399

Cited by 69 publications

(28 citation statements)

References 72 publications

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“…4(c), showing that time-switching can extend absorption bandwidth by changing the permittivity of an absorber whilst a broadband signal enters it. 59 On a related note, Mazor et al unveiled how an excitation can be unitarily transferred between coupled cavities by switching the coupling strength, even if the detuning between the cavities is large. 60 An example of this phenomenon in a coupled LC resonator pair is shown in Fig.…”

Section: Time-interfaces In Spatial Structuresmentioning

confidence: 99%

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-interfaces In Spatial Structuresmentioning

confidence: 99%

Photonics of Time-Varying Media

Galiffi,

Tirole,

Yin

et al. 2021

Preprint

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“…Recent advances in time-modulated materials have attracted significant attention of microwave and optics communities. Dynamically varying materials bring additional engineering freedoms and thus can break the theoretical and technical restrictions imposed on traditional time-invariant systems [6][7][8][9][10][11][12]. In this presentation, we will show that by modulating a metasurface in space and time in a traveling-wave fashion, free-space waves coming from different directions can be collimated into a single direction, without losses of incident energy [see Fig.…”

Section: Introductionmentioning

confidence: 99%

Multiple-Beam Power Combining Using Space-Time Metasurfaces

Wang

Asadchy

Tretyakov

2021

2021 Fifteenth International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials)

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In this talk, we will present a new concept of space-time power combiners which allow perfect power concentration of plane waves from multiple input directions to a single wave propagating into the desired output direction. Such functionality can be realized in metasurfaces with travelling-wave modulations of the surface impedance. The spatiotemporal modulation imparts different spatial and temporal momenta on the incident beams, such that their reflected beams are spatially collimated and their powers are incoherently summed. The proposed technique has very important applications in unidirectional guiding of electromagnetic signals among multiple routes, as well as in high-power laser technologies.

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“…Like in single or multilayered spatial structures, playing with the temporal sequence and application time of the materials over the propagation period enables plenty of intriguing wave phenomena [5], e.g., inverse prism [6], temporal aiming [7], and synthesis of effective media [8], as well as novel devices in time-domain, e.g. antireflection coatings [9,10], temporal Fabry-Perot cavities [10], spacetime crystals [11], and broadband absorbers [12].…”

mentioning

confidence: 99%

Temporal interfaces and metamaterial response enabled by boundaries

Stefanini¹,

Ramaccia²,

Bilotti³

et al. 2021

Preprint

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In the last years, temporal metamaterials have been exploited as a novel platform for conceiving several electromagnetic and optical devices based on the anomalous scattering response achieved at a single or multiple sudden change of their medium properties, which however is difficult to carry out in a realistic scenario In this letter we investigate on the possibility to emulate the scattering response of a temporal metamaterial without acting on the medium properties, but on the effective refractive index and wave impedance perceived by the wave during the propagation within a guiding structure rather than the actual material, by acting on its boundaries. The work presents in closed form the scattering coefficients achieved when the boundary properties are suddenly modified for inducing an effective temporal interface. In this framework, temporally controlled metasurfaces can be used to implement the proposed concept, giving an easier path also to the design and realization of novel devices at microwave and optical frequencies.

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Temporal switching to extend the bandwidth of thin absorbers

Cited by 69 publications

References 72 publications

Photonics of Time-Varying Media

Photonics of Time-Varying Media

Multiple-Beam Power Combining Using Space-Time Metasurfaces

Temporal interfaces and metamaterial response enabled by boundaries

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