Volume 23, Issue 2 (JIAEEE Vol.23 No.2 2026)
Journal of Iranian Association of Electrical and Electronics Engineers 2026, 23(2): 41-46 |
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Afroozeh A. Investigated the optical properties of graphene in a grating structure as an optical absorber and optimized the dimensions of of a single-layer graphene. Journal of Iranian Association of Electrical and Electronics Engineers 2026; 23 (2) :41-46
URL: http://jiaeee.com/article-1-1658-en.html
URL: http://jiaeee.com/article-1-1658-en.html
University of Larestan Department of Electrical Engineering
Abstract: (20 Views)
In this research, the optical properties of monolayer graphene integrated with a periodic plasmonic grating were investigated to develop an efficient optical absorber operating in the near-infrared region. The proposed structure consists of gold nanoribbons placed above a monolayer graphene sheet, h-BN layers serving as a spacer and antireflection coating, and a 70-nm-thick silver substrate. The structure was numerically analyzed using COMSOL Multiphysics based on the finite-element method under TM-polarized plane-wave illumination. The gold nanoribbons enhance light–graphene interaction by exciting localized plasmonic resonances and concentrating the electromagnetic field near the graphene layer. To maximize absorption, the geometrical dimensions of the grating were optimized by varying the nanoribbon width and structural period. The results showed that changing these parameters enables the graphene absorption peak to be controlled over an approximate wavelength range of 1000–1700 nm. The optimized structure, with a nanoribbon width of 50 nm and a grating period of 100 nm, achieved 60% absorption at approximately 1650 nm, corresponding to nearly 26 times the intrinsic absorption of suspended monolayer graphene. Furthermore, the angular response was examined at incidence angles of 15°, 30°, 45°, 60°, 75°, and 90°. The absorption remained above 57% at many of the investigated angles, indicating low angular sensitivity and confirming the potential of the proposed structure for solar absorbers, infrared detectors, optical sensors, and energy-harvesting applications.
Type of Article: Research |
Subject:
Communication
Received: 2023/10/20 | Accepted: 2025/12/23 | Published: 2026/06/22
Received: 2023/10/20 | Accepted: 2025/12/23 | Published: 2026/06/22
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