Journal
MICROMACHINES
Volume 10, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/mi10030194
Keywords
perfect metamaterial absorber; FDTD method; graphene; surface plasmon resonance
Categories
Funding
- National Natural Science Foundation of China (NNSFC) [51606158, 11604311, 11704223]
- Natural Science Foundation of Fujian Province [2018J05008, JZ160459]
- Sichuan Science and Technology Program [2018GZ0521]
- Longshan Academic Talent Research Supporting program of SWUST [18lzx506]
- Postgraduate Innovation Fund Project by the Southwest University of Science and Technology [18ycx034]
- Undergraduate Innovation Fund Project, Southwest University of science and Technology [cx18-060]
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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 theta 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 E-F and relaxation time tau. 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.
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