Tunable Terahertz Polarization Converter Based on Graphene Metasurfaces

In this paper, a tunable Polarization Converter is proposed based on Graphene Metasurfaces in the Terahertz band. It provides a wideband polarization conversion from 6.64 to 8.53 THz with a fractional bandwidth of 38% and a polarization conversion ratio (PCR) of more than 0.97. In this designed structure not only can the frequency response be controlled by localizing the plasmon resonance through altering the geometrical dimensions of its shape but it also can be controlled using the Graphene characteristics to have a tunable frequency response regardless of the variations in geometrical dimensions.