Hilbert resonator-based multiband tunable graphene metasurface polarizer for lower THz frequency

In this article, we propose different Hilbert shape-based tunable and multiband polarizers for the lower-terahertz frequency range. The tunability of this structure is achieved using a single-layer graphene sheet placed between the Hilbert resonator and silica substrate. The tunability of the graphene is further controlled using external biasing conditions which affect the chemical potential value of the graphene sheet. The proposed polarizer structure is investigated for different polarization incident conditions ( X —polarizer, and Y —polarized) and polarization parameters including reflectance coefficient, transmittance coefficient, polarization conversion rate, co-polarization phase, and cross-polarization phase variations. The proposed polarizer structure can serve as the building block for several lower-terahertz systems because of its reconfigurable behavior.