Tunable Terahertz Absorber Based on Hexagonal Graphene Disk Array

Ghajarpour-Nobandegani, Sajad; Karimi, Mohammad Javad; Rahimi, Hamed

doi:10.30495/jopn.2023.31722.1286

Tunable Terahertz Absorber Based on Hexagonal Graphene Disk Array

Document Type : Articles

Authors

¹ Department of Physics, Shiraz University of Technology, Shiraz, Iran.

² Department of Physics, Shiraz University of Technology, Shiraz, Iran

³ Department of Physics, Yazd University, Yazd, Iran.

10.30495/jopn.2023.31722.1286

Abstract

Abstract:
In this paper, a tunable absorber structure based on a graphene hexagonal array in the terahertz range is investigated. The graphene hexagonal absorber is simulated by the finite element method. The effects of the geometry, graphene Fermi energy level and incident light angle, and light polarization on the absorptance of the structure are investigated. The results show that the absorptance spectrum of the proposed absorber is tuned from 6.1 THz to 9.1 THz when the Fermi energy increases from 0.4eV to 0.9eV. The absorptance peak shifts to lower and higher frequencies with increasing hexagonal side length and Fermi energy level, respectively. The absorption of the structure is over 90% in the incident light angle range from 0 to 80º for the TE polarization and in the range of 0-40º for the TM polarization. Also, results indicate that the absorption peaks shift to the lower energies with increasing the dielectric constant of the dielectric layer.

Keywords

20.1001.1.24237361.2023.8.2.1.9

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Journal of Optoelectronical Nanostructures

Volume 8, Issue 2 - Serial Number 30
May 2023
Pages 1-14

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Tunable Terahertz Absorber Based on Hexagonal Graphene Disk Array

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Volume 8, Issue 2 - Serial Number 30
May 2023
Pages 1-14

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Tunable Terahertz Absorber Based on Hexagonal Graphene Disk Array

References

Volume 8, Issue 2 - Serial Number 30May 2023Pages 1-14

Files

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How to cite

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Volume 8, Issue 2 - Serial Number 30
May 2023
Pages 1-14