Tunable Graphene-based Plasmonic Perfect Metamaterial Absorber in the THz Region
Zao Yi,
Jiajia Chen,
Chunlian Cen,
Xifang Chen,
Zigang Zhou,
Yongjian Tang,
Xin Ye,
Shuyuan Xiao,
Wei Luo,
Pinghui Wu
Affiliations
Zao Yi
School of Science, Southwest University of Science and Technology, Mianyang 621010, China
Jiajia Chen
School of Science, Southwest University of Science and Technology, Mianyang 621010, China
Chunlian Cen
School of Science, Southwest University of Science and Technology, Mianyang 621010, China
Xifang Chen
School of Science, Southwest University of Science and Technology, Mianyang 621010, China
Zigang Zhou
School of Science, Southwest University of Science and Technology, Mianyang 621010, China
Yongjian Tang
School of Science, Southwest University of Science and Technology, Mianyang 621010, China
Xin Ye
Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
Shuyuan Xiao
Institute for Advanced Study, Nanchang University, Nanchang 330031, China
Wei Luo
Central South University, Changsha 410013, China
Pinghui Wu
Photonic Technology Research & Development Center, Key Laboratory of Information Functional Material for Fujian Higher Education, Quanzhou Normal University, Fujian 362000, China
The optical performance of a periodically tunable plasma perfect metamaterial absorber based on a square-square-circle array we propose in the terahertz region is analyzed in this work by the finite difference time domain (FDTD) method. We not only discuss the impact of various parameters such as period a, length L, radius R, and incident angle θ under transverse magnetic (TM)- and transverse electric (TE)-polarization on the absorption spectra of the absorber but also study the effect of the Fermi energy EF and relaxation time τ. Finally, we simulate the spectra as the surrounding refractive index n changes to better evaluate the sensing performance of the structure, producing a sensitivity S of the structure of up to 15006 nm/RIU. On account of this research, we find that the absorber is beneficial to sensors and detectors in the terahertz region.
