| Citation: | HAO Xiao-yu, ZHENG Si-yu, WANG Yu, LIU Yang, LIU Meng, ZHANG Yu-ping, ZHANG Jin-juan, ZHAN Yi, ZHANG Hui-yun. Tunable reflective spin-decoupled encoding metasurface based on Dirac semimetals[J]. Chinese Optics. doi: 10.37188/CO.EN-2024-0037
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Multiple functional metasurfaces with high information capacity have attracted considerable attention from researchers. This study proposes a 2-bit tunable decoupled coded metasurface designed for the terahertz band, which utilizes the tunable properties of Dirac semimetals (DSM) to create a novel multilayer structure. By incorporating both geometric and propagating phases into the metasurface design, we can effectively control the electromagnetic wave. When the Fermi energy level of the DSM is set at 6 meV with 80 meV, the electromagnetic wave is manipulated by the DSM patch with the gold patch embedded in the DSM film, operating at a frequency of 1.3 THz and 1.4 THz. Both modes enable independent control of beam splitting under left-rotating circularly polarized (LCP) and right-rotating circularly polarized (RCP) wave excitation, resulting in the generation of vortex beams with distinct orbital angular momentum (OAM) modes. The findings of this study hold significant potential for enhancing information capacity and polarization multiplexing techniques in wireless communications.
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