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Open AccessArticle

Design of a Broadband Tunable Terahertz Metamaterial Absorber Based on Complementary Structural Graphene

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Engineering Research Center for Metallurgical Automation and Detecting Technology Ministry of Education, Wuhan University of Science and Technology, Wuhan 430083, China
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School of Electronic and Information Engineering, Hubei University of Science and Technology, Xianning 437100, China
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School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
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Authors to whom correspondence should be addressed.
Materials 2018, 11(4), 540; https://doi.org/10.3390/ma11040540
Received: 29 January 2018 / Revised: 25 March 2018 / Accepted: 26 March 2018 / Published: 31 March 2018
(This article belongs to the Section Structure Analysis and Characterization)
We present a simple design for a broadband tunable terahertz (THz) metamaterial absorber (MMA) consisting of a complementary cross-oval-shaped graphene (CCOSG) structure and dielectric substrate placed on a continuous metal film. Both numerical simulation and theoretical calculation results indicate that the absorbance is greater than 80% from 1.2 to 1.8 THz, and the corresponding relative bandwidth is up to 40%. Simulated electric field and power loss density distributions reveal that the broadband absorption mainly originates from the excitation of continuous surface plasmon resonance (SPR) on the CCOSG. In addition, the MMA is polarization-insensitive for both transverse-electric (TE) and transverse-magnetic (TM) modes due to the geometry rotational symmetry of the unit-cell structure. Furthermore, the broadband absorption properties of the designed MMA can be effectively tunable by varying the geometric parameters of the unit-cell and chemical potential of graphene. Our results may find promising applications in sensing, detecting, and optoelectronic-related devices. View Full-Text
Keywords: terahertz metamaterial absorber; graphene; broadband tunable absorption; surface plasmon resonances terahertz metamaterial absorber; graphene; broadband tunable absorption; surface plasmon resonances
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MDPI and ACS Style

Huang, M.L.; Cheng, Y.Z.; Cheng, Z.Z.; Chen, H.R.; Mao, X.S.; Gong, R.Z. Design of a Broadband Tunable Terahertz Metamaterial Absorber Based on Complementary Structural Graphene. Materials 2018, 11, 540.

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