biostudies-literatureUnknown12(1)Nishida KIn 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 <i>λ</i>/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.Nanophotonics (Berlin, Germany)139-146https://www.ebi.ac.uk/biostudies/studies/S-EPMC11501191biostudies-literatureAll-optical scattering control in an all-dielectric quasi-perfect absorbing Huygens' metasurface.PMC11501191Takahara JNishida KYen THTang YLSasai KXu RChu SWfalseAll-optical scattering control in an all-dielectric quasi-perfect absorbing Huygens' metasurface.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 <i>λ</i>/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.2023-01-01T00:00:00Z2023 Jan2025-04-04T01:05:58.991Z2025-04-04T01:05:58.991ZS-EPMC115011913963364110.1515/nanoph-2022-0597