Five-Band Tunable Terahertz Metamaterial Absorber Using Two Sets of Different-Sized Graphene-Based Copper-Coin-like Resonators

Author:

Wang Jieru1,Qin Xuefeng1,Zhao Qian1,Duan Guiyuan1,Wang Ben-Xin1ORCID

Affiliation:

1. School of Science, Jiangnan University, Wuxi 214122, China

Abstract

In this paper, a five-band metamaterial absorber with a tunable function in a terahertz band is proposed, which consists of a gold grounding layer, a polyimide dielectric layer, and a periodic patterned graphene layer. The patterned graphene layer is constructed from two sets of copper-coin-shaped structures of different sizes. The designed absorber achieves absorptions of 96.4%, 99.4%, 99.8%, 98.4%, and 99.9% at 4.62 THz, 7.29 THz, 7.70 THz, 8.19 THz, and 8.93 THz, respectively, with an average absorption intensity of 98.78%. The physical mechanism of this five-band absorber was explained by the impedance matching principle and electric field distribution. The absorption performance of the five-band absorber can be effectively tuned by changing the geometry of the patterned graphene array and the thickness of the dielectric layer. Given that the resonant frequency of the absorber varies in proportion to the Fermi level, by varying the Fermi level of the graphene hypersurface, we can achieve the continuous tuning of the absorption performance over a wide frequency range. The five-band absorber has a stable absorption performance over a wide incidence angle of 0–65°, and by combining the merits of high absorption, dynamic adjustability, and a large number of absorption peaks, the given absorber could have great potential for applications in nondestructive testing, imaging, communication, sensing, and detectors.

Funder

National Natural Science Foundation of China

China Postdoctoral Science Foundation

China Scholarship Council

Key Research and Development Program of Zhejiang Province

Key Research and Development Program of Huzhou

Key Lab of Modern Optical Technologies of Education Ministry of China, Soochow University

Jiangsu Province Training Program of Innovation and Entrepreneurship for Undergraduates

Publisher

MDPI AG

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