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year 27, Issue 2 (ICOP & ICPET 2021 2021)
ICOP & ICPET _ INPC _ ICOFS 2021, 27(2): 245-248 |
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Heidari S, Nozhat N. Graphene-Based Plasmonic Absorber with Sensing Application in the Far-infrared Region. ICOP & ICPET _ INPC _ ICOFS 2021; 27 (2) :245-248
URL: http://opsi.ir/article-1-2351-en.html
URL: http://opsi.ir/article-1-2351-en.html
1- Department of Electrical Engineering, Shiraz University of Technology
Abstract: (887 Views)
In this paper, a tunable plasmonic perfect absorber composed of two concentric graphene rings, silicon dioxide layer and gold substrate is designed and simulated. The absorption spectrum of the structure changes by variation of chemical potential and relaxation time of graphene. A perfect absorption peak at the wavelength of 19.26 µm is achieved with the chemical potential and relaxation time of 1eV and 1ps, respectively, which is due to increasing the surface plasmons of graphene. Also, the effect of geometrical parameters on the absorption characteristics is investigated. It is shown that by changing the refractive index of the test medium, the proposed absorber has the high sensitivity of 2323 nm/RIU. According to the obtained results, the proposed absorber can also be used in other applications such as modulators and detectors.
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