Abstract
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.
Highlights
Metamaterials are materials that are arterially fabricated
We have presented the graphene-based broadband metasurface polarizer structure which is working for the far-infrared frequency spectrum
The graphene-based tunable broadband polarizer is investigated over the far-infrared frequency range of 3 to 12 THz
Summary
Graphene is commonly used in the construction of many reconfigurable devices such as gratings [7], tunable absorbers [8], [9], polarizers [2], leaky-wave antennas[10], etc It can be reconfigured by adjusting different physical characteristics such as 2 chemical potential, temperature, frequency, and dispersion rate [11]. The graphene-based polarizers can mainly be tuned with the help of chemical graphene potentials and the frequency which can be altered and can be modified externally[22] In this manuscript, we have presented the graphene-based broadband metasurface polarizer structure which is working for the far-infrared frequency spectrum. Discussion of the different physical parameters and results derived from the designed polarizer is shown in the last section of the manuscript
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