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Materials 2017, 10(6), 591; doi:10.3390/ma10060591

Ultrathin Six-Band Polarization-Insensitive Perfect Metamaterial Absorber Based on a Cross-Cave Patch Resonator for Terahertz Waves

1
School of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
2
Hubei Province Key Laboratory of Occupational Hazard Identification and Control, Wuhan University of Science and Technology, Wuhan 430081, China
3
School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
*
Author to whom correspondence should be addressed.
Academic Editor: Andrea Alu
Received: 18 April 2017 / Revised: 23 May 2017 / Accepted: 23 May 2017 / Published: 28 May 2017
(This article belongs to the Section Structure Analysis and Characterization)
View Full-Text   |   Download PDF [2876 KB, uploaded 28 May 2017]   |  

Abstract

A simple design of an ultrathin six-band polarization-insensitive terahertz perfect metamaterial absorber (PMMA), composed of a metal cross-cave patch resonator (CCPR) placed over a ground plane, was proposed and investigated numerically. The numerical simulation results demonstrate that the average absorption peaks are up to 95% at six resonance frequencies. Owing to the ultra-narrow band resonance absorption of the structure, the designed PMMA also exhibits a higher Q factor (>65). In addition, the absorption properties can be kept stable for both normal incident transverse magnetic (TM) and transverse electric (TE) waves. The physical mechanism behind the observed high-level absorption is illustrated by the electric and power loss density distributions. The perfect absorption originates mainly from the higher-order multipolar plasmon resonance of the structure, which differs sharply from most previous studies of PMMAs. Furthermore, the resonance absorption properties of the PMMA can be modified and adjusted easily by varying the geometric parameters of the unit cell. View Full-Text
Keywords: perfect metamaterial absorber; terahertz; six-band; cave-cross patch resonator perfect metamaterial absorber; terahertz; six-band; cave-cross patch resonator
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Cheng, Y.Z.; Huang, M.L.; Chen, H.R.; Guo, Z.Z.; Mao, X.S.; Gong, R.Z. Ultrathin Six-Band Polarization-Insensitive Perfect Metamaterial Absorber Based on a Cross-Cave Patch Resonator for Terahertz Waves. Materials 2017, 10, 591.

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