A Tunable Hybrid Metamaterial Reflective Polarization Converter Based on Vanadium Oxide Film

A metamaterial reflective converter with vanadium oxide (VO2) film is investigated in this paper. The results indicate that a broadband polarization conversion ratio (PCR) above 90% is achieved from 4.95 to 9.39 THz and the PCR above 98.9% can be obtained at the three peaks. And the hybrid metamaterial converter is demonstrated for realizing temperature tuned electromagnetic properties. The different temperatures across the insulator-to-metal phase transition of the VO2 film can change the conductivity. Furthermore, the broadband and high-efficiency polarization conversion changes obviously with the temperature changing. In addition, this study demonstrates the application of different temperatures on the performance of the sensor. Moreover, surface current distributions at the resonant frequency are also discussed.