Abstract
In this manuscript, patch-shaped graphene metasurface polarizer has been numerically investigated for the far-infrared frequency spectrum. We have identified the resonance response of the proposed polarizer by changing the physical dimensions of the proposed polarizer. The proposed polarizer structure has been investigated for the 1-20 THz of the frequency range. The different physical parameters such as phase variation, polarization conversion rate, reflectance, and transmittance have been investigated for the proposed polarizer structure. Graphene-based polarizer structures are formed with the squared patched geometry, and its complementary condition has been investigated to identify the polarization effect's behavior. The proposed polarizer device is tunable by various values of graphene chemical potential. The calculated polarization conversion rate (PCR) is > 0.9 for the resonating point, showing the linear to circular polarization conversion. The proposed structure works as a tunable polarizer device where the graphene sheet properties can be controlled from external sources. A resonating band of the polarization effect has been identified from the numerical results of polarization conversion rate and cross-polarization behavior. The phase variation is observed between - 180 degrees and 180 degrees in the graphene patch-based polarizer structure. In contrast, the polarizer structure's complementary geometry generates the phase variation between 100 degrees and 180 degrees. The proposed polarizer can be easily fabricated using conventional methods as it does not require a complex structure to engrave the graphene sheet. Ultrathin design and tunable properties of the polarizer structure can be used in many photonics and optoelectronics applications.