Volume 18, Issue 1 (10-2024)                   IJOP 2024, 18(1): 129-138 | Back to browse issues page

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Dolatabady A, Habibi N. Optimized Plasmonic Refractive Index Sensor Based on Graphene Ribbon Array. IJOP 2024; 18 (1) :129-138
URL: http://ijop.ir/article-1-587-en.html
Optimized Plasmonic Refractive Index Sensor Based on Graphene Ribbon Array
Alireza Dolatabady *1 , Nader Habibi2
1- Department of Electrical Engineering, Faculty of Engineering, Ayatollah Boroujerdi University, Boroujerd, Iran
2- Ayatollah Boroujerdi University
Abstract:   (43 Views)
In this paper, a plasmonic refractive index sensor based on a graphene ribbon array is proposed. Graphene ribbons are employed to excite surface plasmon waves, providing a subwavelength sensor. The structure exhibits a resonance feature, enabling wavelength-selective operation. It acts like a band rejection filter. The filtering behavior depends on the absorption of the incident light from an incident port at specific wavelengths. The rejected and absorbed bands depend on the structural parameters of the proposed sensor, such as the refractive index of the material surrounding the ribbons. A change in the refractive index of the material would change the wavelength of the transmitted lightwaves out of the sensor, providing a measuring approach to detect various transparent materials. The operation of the structure is simulated using the finite difference time domain (FDTD) numerical method and verified utilizing a simple characteristic equation. Due to the chemical potential dependency of graphene conductivity, the proposed sensor can be calibrated via an external voltage bias. The optimization of the proposed sensor performance can be accomplished through straightforward utilization of calculus. The proposed subwavelength sensor is widely applicable in terahertz-band applications, such as biological and chemical sensing.
Keywords: Graphene ribbon, Optimization of sensor, Plasmonic structure, Refractive index sensor, Subwavelength structure, Wavelength selective structure.
Full-Text [PDF 740 kb]   (26 Downloads)    
Type of Study: Research | Subject: Nanophotonics and Nanostructures
Received: 2025/06/6 | Revised: 2026/02/1 | Accepted: 2026/01/29 | Published: 2026/02/1
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