Externally Driven Nonlinear Time-Variant Metasurfaces

Zubyuk, Varvara V.; Shafirin, Pavel; Shcherbakov, Maxim R.; Shvets, Gennady; Fedyanin, Andrey A.

doi:10.1021/acsphotonics.1c01222

Cited by 19 publications

(7 citation statements)

References 61 publications

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“…Recently, a blue-shift of the third-harmonic (TH) wavelength (also known as the photon acceleration effect) was observed in silicon metasurfaces supporting Mie resonances in the infrared range . This provides a direct way to control the dynamics of linear and nonlinear signals on the time scales comparable with or even less than the pulse length, as demonstrated in the recent experiments , with time-varying asymmetric metasurfaces. Self-action effects in metasurfaces with sharp resonances attract special attention because the strong field ionization regime can be realized even for moderate pump powers which in turn leads to an increase the mode line width of a high- Q resonance due to the generation of the electron–hole plasma in the material …”

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confidence: 72%

Observation of Ultrafast Self-Action Effects in Quasi-BIC Resonant Metasurfaces

et al. 2021

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High-index dielectric metasurfaces can support sharp optical resonances enabled by the physics of bound states in the continuum (BICs) often manifested in experiment as quasi-BIC resonances. They provide an efficient way to enhance light-matter interaction at the subwavelength scale bringing novel opportunities for nonlinear nanophotonics. Strong narrow-band field enhancement in quasi-BIC metasurfaces leads to an extreme sensitivity to a change of the refractive index that may limit nonlinear functionalities for the pump intensities beyond the perturbative regime. Here we study ultrafast self-action effects observed in quasi-BIC silicon metasurfaces with meta-atoms characterized by a broken in-plane symmetry. We demonstrate how the self-action effects can alter the power dependence of the third-harmonic generation efficiency. We study experimentally a transition from the super-cubic to sub-cubic regimes for the generated third-harmonic power, and measure a blue-shift of the third-harmonic signal on subpicosecond scales in the multiphoton absorption regime. We observe a sharp increase of the third-harmonic linewidth with a growth of the peak pump intensity above the threshold of 10 GW/cm 2 . Our results suggest a direct way to implement ul-trafast nonlinear dynamics in high-index resonant dielectric metasurfaces for nonlinear metaoptics beyond the perturbative regime.

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confidence: 72%

Observation of Ultrafast Self-Action Effects in Quasi-BIC Resonant Metasurfaces

et al. 2021

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“…It poses limitations for the detection of scaled and rotated images and demands new techniques such as tunable metasurfaces. Electric, − magnetic, , or photoinduced − tuning of the metasurface optical response have been recently investigated. In the latter case, direct band gap semiconductors are promising materials, since optically tunable metasurfaces require significant modulation of the refractive index during carrier injection by a femtosecond laser pulse due to the bandfilling, bandgap shrinkage, and free-carrier absorption …”

Section: Discussionmentioning

confidence: 99%

Analog Optical Correlation Augmented by Mie-Resonant Metasurfaces

Yushkov,

Sitnyansky,

Shorokhov

et al. 2024

ACS Photonics

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Optical metasurfaces provide a prospective platform for analog image processing. Recently, they have been used for applications such as denoising and edge enhancement, but their potential for spatial correlation analysis has not been investigated yet. In this paper, we propose a silicon-based metasurface for image detection by spatial optical Fourier filtering in the analog domain. We study, both experimentally and numerically, the constraints of the proposed method for rotated and scaled images and discuss possible solutions to overcome imposed limitations. Our research opens up new possibilities in various real-time image processing applications.

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“…[23] Linear frequency conversion is commonly interpreted from the temporal boundary of the real part of the refractive index, which is a straightforward analogy to the tone change of a guitar by adjusting string length after plucking. However, the dynamics in an unsteady photonic cavity with a subwavelength scale involves more complex processes, including the influence of correlated imaginary parts of the refractive index [24][25][26] and the intrinsic radiative and nonradiative losses of the cavity. The physics becomes nontrivial when all these factors are considered in the temporal boundary in practical scenarios.…”

Section: Introductionmentioning

confidence: 99%

Linear Terahertz Frequency Conversion in a Temporal‐Boundary Metasurface

Xu,

Xing,

et al. 2024

Laser & Photonics Reviews

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Linear frequency conversion enabled by a temporal boundary of a resonant cavity provides a promising alternative to generating new frequency components, where the temporal boundary can be introduced by rapidly modifying the refractive index of the cavity. However, the perturbed photon dynamics during the ultrafast linear process is still vague. Here, the photon dynamics based on temporal coupled‐mode theory are explored and the phenomena are demonstrated with a silicon metasurface via simulations and experiments in the terahertz regime. With the time‐varying real and imaginary parts of the refractive index, a periodic modulation (Td) of the amplification coefficient of the newly generated photons is observed where the optimized coefficient occurs in the first period at td = Td /2. It further establishes a dynamic critical coupling condition to improve the amplification coefficient in the dynamic process. The scheme of linear frequency conversion via temporal boundary can revolutionize the paradigm of parametric amplification from nonlinear to linear processes, and conversion efficiency will be improved in a high‐quality factor cavity. The ultrafast modulation will find applications in optical signal processing, modulators, and reconfigurable intelligent surfaces for development of the next‐generation communications.

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Externally Driven Nonlinear Time-Variant Metasurfaces

Cited by 19 publications

References 61 publications

Observation of Ultrafast Self-Action Effects in Quasi-BIC Resonant Metasurfaces

Observation of Ultrafast Self-Action Effects in Quasi-BIC Resonant Metasurfaces

Analog Optical Correlation Augmented by Mie-Resonant Metasurfaces

Linear Terahertz Frequency Conversion in a Temporal‐Boundary Metasurface

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