Switchable wavefront control using an all-dielectric metasurface mediated by VO2

Abstract

Abstract Active metasurfaces using metal–insulator transition materials such as vanadium dioxide (VO2) have been demonstrated recently. As most of them are based on plasmonic metasurfaces, it is difficult to realize transmissive devices at optical frequencies. In this study, we theoretically propose and demonstrate the transmission type of an active all-dielectric metasurface mediated by VO2. We numerically study the optical properties of a cylindrical Mie resonator consisting of crystalline silicon and VO2 layers, and we find that it achieves a 2π phase shift of approximately 1550 nm by tuning the radius. The proposed structure can be applied to non-mechanical beam steering, polarizers, metalenses, etc.