Thermally switchable high efficient and wideband cross-polarization conversion metasurface based on indium antimonide

Tóm tắt:

The manipulation of EM wave polarization is crucial for unlocking the potential of terahertz (THz) applications in communication, imaging, and sensing. However, achieving switchable polarization control in the THz region remains challenging due to the limited tunability of conventional materials. Here, we propose a thermally switchable reflective polarization conversion metasurface, consisting of an InSb-based resonator array, a dielectric spacer, and a metallic ground plane. The metasurface enables active switching of linear orthogonal polarization conversion through temperature modulation. Simulations show that at 320 K (“ON” state), it achieves efficient cross-polarization conversion with a polarization conversion ratio (PCR) exceeding 0.9 over 0.85–1.74 THz. At 240 K (“OFF” state), the PCR is nearly suppressed, demonstrating strong thermal tunability and binary switching. These findings underscore the promise of InSb-based metasurfaces for high-performance THz polarization modulators and reconfigurable photonic devices.