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

Abstract In this paper, we theoretically and experimentally demonstrated photothermal nonlinearities of both forward backward scattering intensities from quasi-perfect absorbing silicon-based metasurface with only ? /7 thickness. The is efficiently heated up by effect under laser irradiation, which in turn modulates the spectra via thermo-optical effect. Under a few milliwatt continuous-wave excitation at resonance wavelength metasurface, cross-section doubles, reduces to half. Our study opens all-optical dynamical control directionality, would be applicable silicon photonic devices.