Numerical investigation of the tunable polarizer using gold array and graphene metamaterial structure for an infrared frequency range

We propose the tunable polarizer structure using graphene and gold resonator array-based geometry. The proposed structure is investigated numerically from 1 to 7 THz range of frequency. For the different Fermi energy values of the graphene sheet, the graphene-based polarizer is tunable. The Fermi energy of the graphene is ultimately controlled by the external biasing voltages. We present the different results, such as reflectance, transmittance, phase variation, and polarization conversion rate, to identify the behavior of polarizers from the 1 to 7 THz range of frequency. It is achieved the negative effective refractive index at the resonating band which makes the overall structure a metamaterial device. The proposed polarizer shows the wide-angle stability up to 40 degrees of the incident angle. The effect of the different physical parameters was also investigated in this article to identify the suitable resonance frequency. This polarizer structure generates a high-polarization conversion rate which can make this structure work as a linear to the circular polarizer. This structure can work as a basic building block for a large photonics system.