Tunable Graphene-Based Terahertz Cross Polarization Converter via an External Magnetic Field

In this paper, we use graphene to design a broadband reflective cross polarization converter by applying external static magnetic field. The polarization converter can realize cross polarization conversion in the frequency range from 3.62 THz to 5.47 THz (the relative bandwidth is 40.7 %), and its polarization conversion ratio is greater than 90 %. The cross-polarization converter is capable of achieving broadband, efficiently polarization conversion, and is tuned dynamically by varying the magnetic field.