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Open AccessArticle

Numerical Study of Angle-Insensitive and Tunable Dual-Band THz Absorber Using Periodic Cross-Shaped Graphene Arrays

1,2,*, 1,2, 1,2, 1,2, 1,2 and 1,2
1
Department of Photoelectric Information Science and Engineering, School of Science, Jiangnan University, Wuxi 214122, China
2
Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Jiangnan University, Wuxi 214122, China
*
Author to whom correspondence should be addressed.
Materials 2019, 12(13), 2063; https://doi.org/10.3390/ma12132063
Received: 29 May 2019 / Revised: 23 June 2019 / Accepted: 25 June 2019 / Published: 27 June 2019
(This article belongs to the Special Issue Carbon Based Functional Microwave Shields)
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PDF [2838 KB, uploaded 27 June 2019]
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Abstract

A dual-band terahertz (THz) absorber using the periodic cross-shaped graphene arrays is presented. It is shown that the dual-band light absorption enhancement of graphene results from the edge graphene plasmon (EGP) resonance, and the locations of the two absorption peaks can be precisely estimated by using the Fabry-Pérot (F-P) cavity model. Slight residual reflection remains at the two absorption peaks because the input impedance of the cross-arm cannot be perfectly matched with the free space impedance. In addition, the locations of the two absorption bands can be simultaneously tuned by changing the Fermi level of graphene, and they can be independently tuned by changing the width or the length of the cross-arm of graphene. Excellent angle-insensitivity dual-band absorption enhancement of graphene can be maintained for both the transverse electric (TE) and transverse magnetic (TM) polarizations. View Full-Text
Keywords: graphene; THz absorber; angle-insensitive; tunable dual-band; Fabry-Pérot cavity resonance graphene; THz absorber; angle-insensitive; tunable dual-band; Fabry-Pérot cavity resonance
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Sang, T.; Gao, J.; Wang, L.; Qi, H.; Yin, X.; Wang, Y. Numerical Study of Angle-Insensitive and Tunable Dual-Band THz Absorber Using Periodic Cross-Shaped Graphene Arrays. Materials 2019, 12, 2063.

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