Visible light metasurface for adaptive photodetection

Abstract Semiconductor-based sub-wavelength metasurfaces are promising device platforms for the realization of optically thick and electrically thin photodetectors. Strong light–matter interactions in ultrathin film regions provide an opportunity to achieve near-unity absorption dimensions comparable with carrier diffusion length this, turn, leads efficient collection photogenerated carriers. Moreover, use phase change materials can real-time active tuning optical responses metasurface-based devices. In first part this paper, a tunable color filtering is demonstrated using metasurface design made antimony trisulphide (Sb 2 S 3 ) grating placed on top continuous silver layer. Four distinct states be acquired upon (a) changes incident light polarization (b) transitions Sb . Numerical simulations theoretical modeling data show that Fabry–Perot resonances driving phenomena when proposed normally illuminated by electromagnetic field transverse electric polarization. contrast, surface plasmon excited magnetic Furthermore, it shown resonance wavelengths dynamically tuned geometrical parameters. Later, second adaptive photodetection designed integrating 5 nm layer as into structure. The provides interaction maximizes carriers’ efficiency. offers optoelectronic photonic