A Graphene Based Metasurface for Transmittive-type Linear to Circular Polarization Converter with Tunable Characteristics

An ultrathin ($\sim\lambda/11.11$) graphene-based metasurface polarization converter has been discussed in this report. The proposed device is a compact two-layered structure having a periodicity of $\sim\lambda/14.28$. A linearly polarized (LP) electromagnetic wave gets converted to a circularly polarized (CP) wave when it passes through the proposed metasurface between 3 THz and 3.5 THz. The Stokes parameters are calculated to validate the circularly polarized nature of the transmitted wave. The characteristics is tunable in nature owing to the change of applied bias to the graphene layer.