中国物理B ›› 2021, Vol. 30 ›› Issue (12): 126101-126101.doi: 10.1088/1674-1056/ac0794

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Actively tunable dual-broadband graphene-based terahertz metamaterial absorber

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. 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
  • 收稿日期:2021-03-01 修回日期:2021-04-29 接受日期:2021-06-03 出版日期:2021-11-15 发布日期:2021-11-23
  • 通讯作者: Dan Hu E-mail:tylzhd@163.com
  • 基金资助:
    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).

Actively tunable dual-broadband graphene-based terahertz metamaterial absorber

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. 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
  • Received:2021-03-01 Revised:2021-04-29 Accepted:2021-06-03 Online:2021-11-15 Published:2021-11-23
  • Contact: Dan Hu E-mail:tylzhd@163.com
  • Supported by:
    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).

摘要: 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.

关键词: metamaterial, graphene, absorber, terahertz

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.

Key words: metamaterial, graphene, absorber, terahertz

中图分类号:  (Structure of graphene)

  • 61.48.Gh
42.50.Gy (Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption) 42.25.Bs (Wave propagation, transmission and absorption) 78.67.Pt (Multilayers; superlattices; photonic structures; metamaterials)