A polarization-insensitive and omnidirectional broadband terahertz metamaterial absorber based on coplanar multi-squares films

被引：138

作者：

Cheng, Yongzhi ^{[1
]}

Nie, Yan ^{[1
]}

Gong, Rongzhou ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, Wuhan 430074, Peoples R China

来源：

OPTICS AND LASER TECHNOLOGY | 2013年 / 48卷

基金：

中国国家自然科学基金;

关键词：

Metamaterial absorber; Polarization-insensitive; Broadband absorption; ABSORPTION;

D O I：

10.1016/j.optlastec.2012.11.016

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A simple design of terahertz metamaterial absorber (MA) based on a periodic array of square copper films was investigated numerically. The perfect narrow absorption mainly originates from magnetic polariton excitation and perfect impedance-match. The perfect absorbing properties of this simple design could be tunable by changing the side length based on equivalent LC resonance circuit mode. The bandwidth of the perfect absorption can be effectively enhanced by simply patterning different dimension elements with appropriate geometrical parameters on a coplanar. Finally, the absorption of the composite structure MA is greater than 90% and near perfect impedance-match to the free space in the frequency ranges of 6.24-7.04 THz. Further numerical simulations also demonstrate that the MA could achieve very high absorptivity at wide angles of incidence and polarization for both TE and TM waves. Crown Copyright (C) 2012 Published by Elsevier Ltd. All rights reserved.

引用

页码：415 / 421

页数：7

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