Design and Optimization of Plasmonic Refractive Index Sensors Using Concentric Resonators and Wire Gratings
| dc.contributor.author | Ali, Masrur Ibne | |
| dc.contributor.author | Mostafa , Mustafid Bin | |
| dc.contributor.author | Rahim, Imtiaz Tanweer | |
| dc.date.accessioned | 2026-07-02T06:06:38Z | |
| dc.date.issued | 2025-10-25 | |
| dc.description | Supervised by Dr. Rakibul Hasan Sagor, Professor, Department of Electrical and Electronic Engineering (EEE) Islamic University of Technology (IUT) Board Bazar, Gazipur, Bangladesh This thesis is submitted in partial fulfillment of the requirement for the degree of Bachelor of Science in Electrical and Electronic Engineering, 2025 | |
| dc.description.abstract | Plasmonic refractive index (RI) sensors, while pivotal in biosensing and chemical detection, face limitations with conventional materials like gold and silver, including high optical losses and fabrication incompatibility. This thesis explores the design, optimization, and performance evaluation of advanced plasmonic sensing platforms to address these challenges. We propose and numerically analyze a novel metal-insulator-metal (MIM) waveguide-based sensor featuring a multi-layered composite resonator with an integrated nanorod array. The structure's performance is rigorously optimized, demonstrating a maximum sensitivity of 1800 nm/RIU and a Figure of Merit (FOM) of 34.0 for the optimal 10-nanorod configuration. Furthermore, we investigate Titanium Nitride (TiN) as an alternative plasmonic material, achieving a sensitivity of 1800 nm/RIU, thereby validating its potential as a durable and CMOS-compatible substitute. In parallel, we design and optimize plasmonic grating circuits based on triangular and circular geometries for surface plasmon resonance (SPR) sensing. The triangular grating sensor achieves a sensitivity of 600 nm/RIU and a high FOM of 80.28 RIU⁻¹, outperforming many existing grating-based sensors. Collectively, this work demonstrates significant advancements in plasmonic sensor design through innovative resonator geometries and the integration of alternative materials, paving the way for highly sensitive, robust, and practical sensing applications. | |
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| dc.identifier.uri | https://repository.iutoic-dhaka.edu/handle/123456789/2659 | |
| dc.language.iso | en | |
| dc.publisher | Department of Electrical and Electronic Engineering (EEE), Islamic University of Technology(IUT), Board Bazar, Gazipur-1704, Bangladesh | |
| dc.title | Design and Optimization of Plasmonic Refractive Index Sensors Using Concentric Resonators and Wire Gratings | |
| dc.type | Thesis |
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