All-optical scattering control in an all-dielectric quasi-perfect absorbing Huygens' metasurface
Nanophotonics(2023)
摘要
In this paper, we theoretically and experimentally demonstrated photothermal nonlinearities of both forward and backward scattering intensities from quasi-perfect absorbing silicon-based metasurface with only lambda/7 thickness. 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 at the resonance wavelength of the metasurface, 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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关键词
Mie resonance,nanophotonics,optical nonlinearity,photothermal effect,silicon nanostructure
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