Broadband multifunctional metasurface based on voltage-tunable VO2

Abstract

THz metasurfaces that reflect radiation back can be applied in various fields such as imaging, biosensing, and optical communications. However, the conventional THz metasurfaces have limitations due to their inflexible electromagnetic responses and complex structures. In this paper, a voltage-controlled dual-polarization metasurface based on vanadium dioxide (VO2) is proposed, which can achieve the polarization conversion and transmission by controlling the conductivity of VO2 in the surface. The results show that when the VO2 is in the metal state, the metasurface can realize the circular polarization mode conversion in the range of 1.2-1.4 THz. While insulated, it will switch to the low-efficiency transmission conversion mode. Then, A broadband voltage-controlled OAM beam generator metasurface is designed, providing a method for realizing high performance multifunctional tunable metasurfaces in the THz band. This work has the potential to expand the practical applications of metasurfaces.