Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 34, Issue 13, Pages 707-710Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2022.3182783
Keywords
Optical fiber sensors; Sensors; Optical fibers; Sensitivity; Refractive index; Optical fiber dispersion; Drilling; Surface plasmon resonance; biosensor; drilled channel; nanowire; sensor
Funding
- Second Century Fund
- Rachadapisek Sompote Fund for Intelligent Control Automation of Process Systems Research Unit, Chulalongkorn University
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This article proposes a novel approach to develop a highly sensitive surface plasmon resonance-based fiber optics biosensor. The sensor demonstrates high sensitivity and its performance is evaluated by analyzing various structural parameters and fabrication tolerance. The designed sensor shows high sensitivity for different refractive indexes.
In this letter, we propose a novel approach to develop a highly sensitive surface plasmon resonance (SPR) based fiber optics biosensor. The sensor comprises a dual-drilled channel (DDC) with gold-nanowire (AuNW) contained in each channel to excite the plasmon modes. The SPR effect between the core guided mode and the surface plasmon polariton (SPP) modes of the DDC is used to evaluate the sensing response with respect to different analytes. The sensing performance, coupling characteristics, and the fabrication tolerance of the sensor are numerically analyzed and characterized by using a full-vectorial Finite Element Method (FEM). The designed sensor shows a minimum sensitivity of 3150 nm/RIU for refractive index (RI) = 1.310. While, the sensor exhibits an extremely high sensitivity varying from 10250 nm/RIU to 90500 nm/RIU for RI varied over the range of 1.370 to 1.400. Various structural parameters, e.g., separation of the channel from the core, the radius of the AuNW, the fabrication tolerance, etc., have been studied in this work. In addition, the possible fabrication steps of such a design have been discussed indicating its simple practical realization.
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