Dan Hu(胡丹)1, Hong-yan Wang(王红燕)2, Zhen-jie Tang(汤振杰)1,Xi-wei Zhang(张希威)1, Lin Ju(鞠琳)1, Hua-ying Wang(王华英)3
1. College of Physics and Electrical Engineering, Anyang Normal University, Anyang 455000, China; 2. College of Media and Communications, Anyang Normal University, Anyang 455000, China; 3. College of Science, Hebei University of Engineering, Handan 056038, China
Abstract A thin-flexible multiband terahertz metamaterial absorber (MA) has been investigated. Each unit cell of the MA consists of a simple metal structure, which includes the top metal resonator ring and the bottom metallic ground plane, separated by a thin-flexible dielectric spacer. Finite-difference time domain simulation indicates that this MA can achieve over 99% absorption at frequencies of 1.50 THz, 3.33 THz, and 5.40 THz by properly assembling the sandwiched structure. However, because of its asymmetric structure, the MA is polarization-sensitive and can tune the absorptivity of the second absorption peak by changing the incident polarization angle. The effect of the error of the structural parameters on the absorption efficiency is also carefully analyzed in detail to guide the fabrication. Moreover, the proposed MA exhibits high refractive-index sensing sensitivity, which has potential applications in multi-wavelength sensing in the terahertz region.
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11504006), the Key Scientific Research Project of Higher Education of Henan Province, China (Grant No. 15A140002), and the Science and Technology Planning Project of Henan Province, China (Grant No. 142300410366).
Corresponding Authors:
Dan Hu, Hua-ying Wang
E-mail: tylzhd@163.com;pbxsyingzi@126.com
Cite this article:
Dan Hu(胡丹), Hong-yan Wang(王红燕), Zhen-jie Tang(汤振杰),Xi-wei Zhang(张希威), Lin Ju(鞠琳), Hua-ying Wang(王华英) Design of a multiband terahertz perfect absorber 2016 Chin. Phys. B 25 037801
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