Circularly polarized terahertz wave independently controlled tunable spin-decoupled metasurface
Yuping Zhang, Chunyang Jiang, Zhenkai Li, Xiaotong Sang, Jian Wang, Xiangzhe Sun, Shengjie Zhao, Bo Lu, Meng Liu, Huiyun Zhang
Abstract
• Function switching under the same incident condition. • Function switching under different incident conditions. • The topological charge 1 to 2 of the vortex beam is switched. • Achieve bands in the terahertz range. The research and development of multifunctional metasurfaces has attracted much attention, and manipulating multifunctional devices with greater degrees of freedom is a continuing trend. In this study, we propose a tunable multifunctional metasurface with terahertz (THz) frequency and demonstrate it theoretically. By introducing the propagation phase decoupling conjugate response, we realize the independent control of beam deflection(deflection angle is 8.1°), beam splitting（split angle is 16.5°）, and vortex beam mode switching under different incident conditions. At the same time, by changing the Fermi level of the Dirac semimetal, the switching between different states under the same incident condition is realized. The results of this study are expected to contribute to promising applications in future for improving the capacity of THz communication systems, independently regulating multi-functional devices.