Design of a High-Efficiency Reconfigurable Anomalous Transmission Metasurface Using Sb2Se3

Reconfigurable metasurfaces (R-MTSs) exhibit significant potential for wireless optical switching due to their compact size and rapid beam switching capabilities. However, conventional R-MTSs based on micro-electro-mechanical systems, electrochemical, or chemical reactions often suffer from high losses and bulky dimensions. In this study, we propose a novel R-MTS design utilizing the low-loss phase-change material Sb2Se3. By modulating the crystalline and amorphous states of Sb2Se3, the metasurface achieves reconfigurability. Notably, under circularly polarized light (C-band), it generates two symmetrically high-efficiency anomalous transmission beams corresponding to the two phase states of Sb2Se3. Simulation results indicate that our design covers an angular range of approximately 34.2° through the Sb2Se3 state transition, maintaining a transmission rate >85.3% and polarization conversion efficiency >96.2%.