Terahertz switchable broadband linear-to-linear/ circular polarization converter based on vanadium dioxide

In this paper, a terahertz (THz) polarization device that achieves four polarization conversion modes with high relative bandwidth and high performance by varying the phase transition properties of vanadium dioxide (VO 2 ) is investigated. In particular, when the device behaves as an orthogonal linear polarization converter, it has a polarization conversion ratio greater than 0.9, an operating bandwidth of 2.14 THz, and a relative bandwidth of 99.5%. In addition, the relationship between different polarization conversion modes of this polarization converter can be analyzed by the Jones matrix. The proposed VO 2 -based switchable THz polarization converter has important potential for applications in fields such as THz communication encryption and bio-detection.