Reconfigurable Microwave Polarizer and Ultra-‌Broadband THz Absorber Using Graphene-Quartz-Graphene Structure: Analysis and Design

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Document Type : Original Article

Authors

1 Faculty of Electrical and Computer Engineering, University of Zanjan, Zanjan, Iran.

2 Electrical Engineering, Faculty of Electrical and Computer Engineering, University of Zanjan, Zanjan, Iran

Abstract

An analytical aproach is presented to solve the problem of an obliquley plane-wave impinging on two sheets of biased-graphene with a static electromagnetic fields for providing physical insight into the graphene anisotropy. It is firstly shown that anisotropic behavior of surface conductivity of a biased-graphene sheet can be modeled by Drude model form. Using such a model, an analysis of the plane-wave diffraction by a graphene-quartz-graphene structure is developed for various incident angles of TE and TM polarizations. The reflection and transmission coefficients of such a structure are calculated for different values of graphene’s chemical potential and thickness of substrate. By studying the calculated results, it is found that using such a structure leads to polarization rotation of the incident plane-wave. This rotation angle for TM-polarized plane-waves is larger than TE-polarized ones once the incident wave is obliqulely impinging on such a structure. Finally, by proposing a new unit cell and changing the chemical potential of graphene sheets, an ultra-broadband (>190%) and tunable absorber is designed and numerically simulated within 0.1~7THz. It is shown that the proposed absorber has an excellent performance (absorbitivity > 80%) for both TE- and TM-polarized obliquley incident plane-waves once the incidence angle < 80o.

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TABRIZ JOURNAL OF ELECTRICAL ENGINEERING

Articles in Press, Corrected Proof
Available Online from 15 January 2025

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