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Gold-Film-Thickness Dependent SPR Refractive Index and Temperature Sensing with Hetero-Core Optical Fiber Structure

by Rui Zhang 1, Shengli Pu 1,2,* and Xinjie Li 1
1
College of Science, University of Shanghai for Science and Technology, Shanghai 200093, China
2
Shanghai Key Laboratory of Modern Optical System, University of Shanghai for Science and Technology, Shanghai 200093, China
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(19), 4345; https://doi.org/10.3390/s19194345
Received: 9 September 2019 / Revised: 1 October 2019 / Accepted: 3 October 2019 / Published: 8 October 2019
(This article belongs to the Section Physical Sensors)
A simple hetero-core optical fiber (MMF-NCF-MMF) surface plasmon resonance (SPR) sensing structure was proposed. The SPR spectral sensitivity, full width of half peak (FWHM), valley depth (VD), and figure of merit (FOM) were defined to evaluate the sensing performance comprehensively. The effect of gold film thickness on the refractive index and temperature sensing performance was studied experimentally. The optimum gold film thickness was found. The maximum sensitivities for refractive index and temperature measurement were obtained to be 2933.25 nm/RIU and −0.91973 nm/°C, respectively. The experimental results are helpful to design the SPR structure with improved sensing performance. The proposed SPR sensing structure has the advantages of simple structure, easy implementation, and good robustness, which implies a broad application prospect. View Full-Text
Keywords: refractive index sensing; temperature sensing; optical fiber sensor; hetero-core fiber structure; surface plasmon resonance refractive index sensing; temperature sensing; optical fiber sensor; hetero-core fiber structure; surface plasmon resonance
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Zhang, R.; Pu, S.; Li, X. Gold-Film-Thickness Dependent SPR Refractive Index and Temperature Sensing with Hetero-Core Optical Fiber Structure. Sensors 2019, 19, 4345.

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