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arXiv · 2207.03705

All-optical scattering control in an all-dielectric quasi-perfect absorbing Huygens metasurface

Kentaro Nishida·Koki Sasai·Rongyang Xu·Te-Hsin Yen·Yu-Lung Tang·Junichi Takahara·Shi-Wei Chu
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Abstract

In this paper, we theoretically and experimentally demonstrated photothermally-induced nonlinearities of both forward and backward scattering intensities from quasi-perfect absorbing silicon-based metasurface. The metasurface is efficiently heated up by photothermal effect under laser irradiation, which in turn modulates the scattering spectra via thermo-optical effect. Under a few milliwatt continuous-wave excitation, backward scattering cross-section doubles, and forward scattering cross-section reduces to half. Our study opens up the all-optical dynamical control of the scattering directionality, which would be applicable to silicon photonic devices.

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Kentaro Nishida, Koki Sasai, Rongyang Xu, Te-Hsin Yen, Yu-Lung Tang, Junichi Takahara, Shi-Wei Chu. 2022-07-08. All-optical scattering control in an all-dielectric quasi-perfect absorbing Huygens metasurface. https://doi.org/10.1515/nanoph-2022-0597

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