Dual-pattern broadband polarization converter in THz band based on graphene and VO2 hybrid metasurface
Wenxuan Li, Jianfeng Sun, Chenxi Su, Panpan Gao, Xueyu Wang, Xiajun Liu, Feng Xia, Kun Zhang, Lifeng Dong, Maojin Yun
Abstract
We propose a dual-pattern broadband polarization converter in the terahertz band using a vanadium dioxide (VO2) and graphene metasurface. The converter can be switched between transmission and reflection patterns by controlling the phase of VO2. In the insulating state of VO2 and with the Fermi energy of graphene (Ef) set to 1 eV, the converter works in transmission mode and can convert linearly polarized waves. In the metallic state of VO2 and with Ef set to = 0 eV, the converter works in reflection mode and can function as a quarter-wave plate. The proposed converter is expected to have applications in integrated devices that control the polarization state of terahertz waves.