Abstract
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 (VO2) 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 VO2-based switchable THz polarization converter has important potential for applications in fields such as THz communication encryption and bio-detection.
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