Dan Hu(胡丹)1,†, Tian-Hua Meng(孟田华)2, Hong-Yan Wang(王红燕)3, and Mai-Xia Fu(付麦霞)4
1 School of Physics and Electrical Engineering, Anyang Normal University, Anyang 455000, China; 2 Department of Physics and Electronics Science, Shanxi Datong University, Datong 037009, China; 3 School of Education Information Technology and Communication, Anyang Normal University, Anyang 455000, China; 4 College of Information Science and Engineering, Henan University of Technology, Key Laboratory of Grain Information Processing and Control, Ministry of Education, Zhengzhou 450001, China
Abstract A tunable metamaterial absorber (MA) with dual-broadband and high absorption properties at terahertz (THz) frequencies is designed in this work. The MA consists of a periodic array of flower-like monolayer graphene patterns at top, a SiO2 dielectric spacer in middle, and a gold ground plane at the bottom. The simulation results demonstrate that the designed MA has two wide absorption bands with an absorption of over 90% in frequency ranges of 0.68 THz-1.63 THz and 3.34 THz-4.08 THz, and the corresponding relative bandwidths reach 82.3% and 20%, respectively. The peak absorptivity of the absorber can be dynamically controlled from less than 10% to nearly 100% by adjusting the graphene chemical potential from 0 eV to 0.9 eV. Furthermore, the designed absorber is polarization-insensitive and has good robustness to incident angles. Such a high-performance MA has broad application prospects in THz imaging, modulating, filtering, etc.
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11504006 and 61805072) and the Key Scientific Research Project of Colleges and Universities in Henan Province, China (Grant No. 22A140001).
Corresponding Authors:
Dan Hu
E-mail: tylzhd@163.com
Cite this article:
Dan Hu(胡丹), Tian-Hua Meng(孟田华), Hong-Yan Wang(王红燕), and Mai-Xia Fu(付麦霞) Actively tunable dual-broadband graphene-based terahertz metamaterial absorber 2021 Chin. Phys. B 30 126101
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