Journal
BRAZILIAN JOURNAL OF PHYSICS
Volume 52, Issue 1, Pages -Publisher
SPRINGER
DOI: 10.1007/s13538-021-01016-0
Keywords
Polarizer; Tunability; Infrared; Metasurface; Graphene; Ultrathin; Terahertz
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This paper proposes a tunable graphene-assisted polarizer structure operating in the infrared frequency range. The structure can achieve tunable polarization by adjusting the Fermi energy, and it exhibits high reflection amplitude and strong polarization amplitude.
This paper proposes the tunable graphene-assisted polarizer structure which is working on the infrared frequency range. The tunable polarizer has been designed by a three-layered structure of silica, graphene, and gold. The polarizer behavior of the structure is analyzed for the frequency range of 3 to 12 THz. The tunability of the structure is analyzed for the different values of Fermi energy which is a tunable parameter of the single-layer graphene sheet. Polarizer response is derived in terms of different performance parameters such as reflectance, phase variation, phase difference, polarization conversion rate, and effective refractive indices. Graphene-based polarizer structure is investigated for the co-polarization and cross-polarization input incident conditions to check linear to circular polarization conversion. It also shows an effective refractive index response to check the metasurface behavior of the polarizer for the 3 to 12 THz range. We have observed that the polarization amplitude becomes stronger for the higher Fermi energy value of the graphene sheet. The reflection amplitude is achieved up to 90%. Results of the proposed polarizer structure can be used to design the various electro-optical structure which operates in the lower terahertz range.
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