Tunable Terahertz Absorber Based on Hexagonal Graphene Disk Array

Journal of Optoelectronical Nanostructures

مقاله 1، دوره 8، شماره 2 - شماره پیاپی 30، مرداد 2023، صفحه 1-14   

نوع مقاله: Articles

شناسه دیجیتال (DOI): 10.30495/jopn.2023.31722.1286

نویسندگان

Sajad Ghajarpour-Nobandegani¹؛ Mohammad Javad Karimi^{* 2}؛ Hamed Rahimi³

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

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

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

تاریخ دریافت: 10 اردیبهشت 1402،  تاریخ بازنگری: 06 خرداد 1402،  تاریخ پذیرش: 12 خرداد 1402 

چکیده

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. 

کلیدواژه‌ها

Graphene؛ Absorptance؛ Terahertz؛ Metamaterial؛ Absorber

مراجع

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