Simple Design of Polarization-Selective Tunable Triple Terahertz Absorber Based on Graphene Rectangular Ring Resonator
Jiang Wang,
Haixia Zhu,
Bo Ni,
Minhao Zhou,
Chengtao Feng,
Haibin Ni,
Jianhua Chang
Affiliations
Jiang Wang
School of Microelectronics and Control Engineering, Changzhou University, Changzhou 213159, China
Haixia Zhu
Jiangsu Key Laboratory of Meteorological Observation and Information Processing, School of Electronic and Information Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China
Bo Ni
Jiangsu Key Laboratory of Meteorological Observation and Information Processing, School of Electronic and Information Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China
Minhao Zhou
School of Microelectronics and Control Engineering, Changzhou University, Changzhou 213159, China
Chengtao Feng
School of Microelectronics and Control Engineering, Changzhou University, Changzhou 213159, China
Haibin Ni
Jiangsu Key Laboratory of Meteorological Observation and Information Processing, School of Electronic and Information Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China
Jianhua Chang
Jiangsu Key Laboratory of Meteorological Observation and Information Processing, School of Electronic and Information Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China
In this paper, a simple design of a polarization-selective tunable triple terahertz absorber based on a graphene rectangular ring resonator was proposed and studied. The absorber structure consists of a graphene rectangular ring resonant array on the top, SiO2 dielectric layer in the middle and gold at the bottom. The calculated results show that the absorber can achieve high-efficiency triple-band absorption under both x and y polarization incident light. When x-polarized light is incident, three distinctive absorption peaks at 2.73, 5.70 and 11.19 THz with absorption rates of 96.7%, 98.5% and 96.5% are achieved. When y-polarized light is incident, three additional absorption peaks at 2.29, 7.55 and 9.98 THz can be obtained with absorption rates of 96.3%, 90.3% and 97.4%, respectively. Moreover, the absorption wavelength of the absorber can be tuned by adjusting the chemical potential of the graphene. Owing to the high efficiency of triple-band absorption in different polarization states, the absorber has broad application prospects in terahertz polarization imaging, sensing and detection.
