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Ultrathin, polarization-insensitive multi-band absorbers based on graphene metasurface with THz sensing application

journal contribution
posted on 2024-11-02, 14:41 authored by Saeedeh Barzegar-Parizi, Amir EbrahimiAmir Ebrahimi
This article presents multi-band plasmonic absorbers based on a graphene array at terahertz frequencies. The absorbers are made of a very simple structure including a graphene disk array printed on the top surface of a dielectric spacer backed by a metallic ground plane. Multi-band performance is achieved with more than 90% absorption in the 1–8 THz frequency range by exciting surface plasmon polaritons of graphene. It is shown that the resonance frequencies of the proposed absorber can be tuned by varying the chemical potential between 0.8–1 eV for a triple-band absorber and 0.7–0.9 eV for a quad-band one, while keeping more than 80% absorption. The results obtained by means of full-wave simulation are verified with the results obtained by the analytical circuit model. The proposed absorbers are polarization-insensitive and provide stable absorption performance for both of the TE and TM polarizations. As an application, we designed a refractive index sensor based on the triple-band absorber. The results verify that the absorption bands are sensitive to the variations of the refractive index of the coating layer.

History

Journal

Journal of the Optical Society of America B: Optical Physics

Volume

37

Issue

8

Start page

2372

End page

2381

Total pages

10

Publisher

Optical Society of America

Place published

United States

Language

English

Copyright

© 2020 Optical Society of America

Former Identifier

2006103464

Esploro creation date

2021-04-21

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