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Tunable Graphene-based Plasmonic Perfect Metamaterial Absorber in the THz Region

2019; Multidisciplinary Digital Publishing Institute; Volume: 10; Issue: 3 Linguagem: Inglês

10.3390/mi10030194

2072-666X

Zao Yi, Jiajia Chen, Chunlian Cen, Xifang Chen, Zigang Zhou, Yongjian Tang, Xin Ye, Shuyuan Xiao, Wei Luo, Pinghui Wu,

Advanced Antenna and Metasurface Technologies

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.