Temperature-Controlled Terahertz Polarization Conversion Bandwidth

Active control of metasurfaces has attracted widespread attention because of the adjustable electromagnetic properties obtained. Here we designed and experimentally studied a dynamically controllable polarization converter in the terahertz band. By designing the structural parameters and utilizing the insulator-to-metal phase transition of vanadium dioxide and principle of current resonance, dynamic tunability of the polarization conversion function from dual-broadband (0.45 similar to 0.77 THz and 0.97 similar to 1.2 THz) to ultra-broadband (0.38 similar to 1.20 THz) can be realized with a high polarization conversion ratio. The scheme proposed here can find potential applications in integrated terahertz systems, sensing, imaging and communications areas. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement