ORIGINAL RESEARCH article
Front. Phys.
Sec. Optics and Photonics
Volume 13 - 2025 | doi: 10.3389/fphy.2025.1676348
A Novel Surface Plasmon-Based Sensor for Liquid Refractive Index Measurement with Biochemical Sensing Capabilities
Provisionally accepted
- 1Zhejiang University of Water Resources and Electric Power, Hangzhou, China
- 2North University of China, Taiyuan, China
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In this work, a highly sensitive wavelength sensor based on a metal-insulator-metal (MIM) waveguide is presented to increase sensitivity and quality factor by optimizing critical structural factors that control sensing performance. The sensor utilizes a waveguide and a circular ring structure (DTRS) with disk and T-shaped cavities to excite the Fano resonance, and the refractive index is sensed at the nanoscale by detecting the resonance wavelength shift. By systematically investigating the coupling and correlation mechanism between device architecture and operating parameters on performance indexes, a full-parameter optimization strategy is adopted to establish the device configuration with the best performance. The sensitivity of the device can reach 2820 nm/RIU, and the FOM value can reach 60, which is of great value in the fields of biomolecule detection, environmental monitoring and chip integration.
Keywords: Metal-insulator-metal waveguide1, Fano resonance2, DTRS3, Refractive index sensing4, Sensitivity optimization5
Received: 30 Jul 2025; Accepted: 03 Oct 2025.
Copyright: © 2025 Yan, Yang, Wang, Yan and Wu. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Shubin Yan, yanshb@zjweu.edu.cn
Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.