Design of a Penta-Band Graphene-Based Terahertz Metamaterial Absorber with Fine Sensing Performance
Runing Lai,
Hao Chen,
Zigang Zhou,
Zao Yi,
Bin Tang,
Jing Chen,
Yougen Yi,
Chaojun Tang,
Jianguo Zhang,
Tangyou Sun
Affiliations
Runing Lai
Joint Laboratory for Extreme Conditions Matter Properties, Tianfu Institute of Research and Innovation, State Key Laboratory of Environmental Friendly Energy Materials, Key Laboratory of Manufacturing Process Testing Technology of Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China
Hao Chen
Joint Laboratory for Extreme Conditions Matter Properties, Tianfu Institute of Research and Innovation, State Key Laboratory of Environmental Friendly Energy Materials, Key Laboratory of Manufacturing Process Testing Technology of Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China
Zigang Zhou
Joint Laboratory for Extreme Conditions Matter Properties, Tianfu Institute of Research and Innovation, State Key Laboratory of Environmental Friendly Energy Materials, Key Laboratory of Manufacturing Process Testing Technology of Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China
Zao Yi
Joint Laboratory for Extreme Conditions Matter Properties, Tianfu Institute of Research and Innovation, State Key Laboratory of Environmental Friendly Energy Materials, Key Laboratory of Manufacturing Process Testing Technology of Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China
Bin Tang
School of Microelectronics and Control Engineering, Changzhou University, Changzhou 213164, China
Jing Chen
College of Electronic and Optical Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
Yougen Yi
College of Physics and Electronics, Central South University, Changsha 410083, China
Chaojun Tang
College of Science, Zhejiang University of Technology, Hangzhou 310023, China
Jianguo Zhang
Department of Physics, Jinzhong University, Jinzhong 030619, China
Tangyou Sun
Guangxi Key Laboratory of Precision Navigation Technology and Application, Guilin University of Electronic Technology, Guilin 541004, China
This paper presents a new theoretical proposal for a surface plasmon resonance (SPR) terahertz metamaterial absorber with five narrow absorption peaks. The overall structure comprises a sandwich stack consisting of a gold bottom layer, a silica medium, and a single-layer patterned graphene array on top. COMSOL simulation represents that the five absorption peaks under TE polarization are at fI = 1.99 THz (95.82%), fⅡ = 6.00 THz (98.47%), fⅢ = 7.37 THz (98.72%), fⅣ = 8.47 THz (99.87%), and fV = 9.38 THz (97.20%), respectively, which is almost consistent with the absorption performance under TM polarization. In contrast to noble metal absorbers, its absorption rates and resonance frequencies can be dynamically regulated by controlling the Fermi level and relaxation time of graphene. In addition, the device can maintain high absorptivity at 0~50° in TE polarization and 0~40° in TM polarization. The maximum refractive index sensitivity can reach SV = 1.75 THz/RIU, and the maximum figure of merit (FOM) can reach FOMV = 12.774 RIU−1. In conclusion, our design has the properties of dynamic tunability, polarization independence, wide-incident-angle absorption, and fine refractive index sensitivity. We believe that the device has potential applications in photodetectors, active optoelectronic devices, sensors, and other related fields.
