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Wedged Fiber Optic Surface Plasmon Resonance Sensor for High-Sensitivity Refractive Index and Temperature Measurements

Here, we experimentally demonstrate a wedged fiber optic surface plasmon resonance (SPR) sensor enabling high-sensitivity temperature detection. The sensing probe has a geometry with two asymmetrical bevels, with one inclined surface coated with an optically thin film supporting propagating plasmons...

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Detalles Bibliográficos
Autores principales: Li, Lixia, Li, Yuli, Zong, Xueyang, Zhao, Linlin, Li, Penglei, Yu, Kun, Liu, Yufang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9739012/
https://www.ncbi.nlm.nih.gov/pubmed/36501796
http://dx.doi.org/10.3390/s22239099
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author Li, Lixia
Li, Yuli
Zong, Xueyang
Zhao, Linlin
Li, Penglei
Yu, Kun
Liu, Yufang
author_facet Li, Lixia
Li, Yuli
Zong, Xueyang
Zhao, Linlin
Li, Penglei
Yu, Kun
Liu, Yufang
author_sort Li, Lixia
collection PubMed
description Here, we experimentally demonstrate a wedged fiber optic surface plasmon resonance (SPR) sensor enabling high-sensitivity temperature detection. The sensing probe has a geometry with two asymmetrical bevels, with one inclined surface coated with an optically thin film supporting propagating plasmons and the other coated with a reflecting metal film. The angle of incident light can be readily tuned through modifying the beveled angles of the fiber tip, which has a remarkable impact on the refractive index sensitivity of SPR sensors. As a result, we measure a high refractive index sensitivity as large as 8161 nm/RIU in a wide refractive index range of 1.333–1.404 for the optimized sensor. Furthermore, we carry out a temperature-sensitivity measurement by packaging the SPR probe into a capillary filled with n-butanol. This showed a temperature sensitivity reaching up to −3.35 nm/°C in a wide temperature range of 20 °C–100 °C. These experimental results are well in agreement with those obtained from simulations, thus suggesting that our work may be of significance in designing reflective fiber optic SPR sensing probes with modified geometries.
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spelling pubmed-97390122022-12-11 Wedged Fiber Optic Surface Plasmon Resonance Sensor for High-Sensitivity Refractive Index and Temperature Measurements Li, Lixia Li, Yuli Zong, Xueyang Zhao, Linlin Li, Penglei Yu, Kun Liu, Yufang Sensors (Basel) Communication Here, we experimentally demonstrate a wedged fiber optic surface plasmon resonance (SPR) sensor enabling high-sensitivity temperature detection. The sensing probe has a geometry with two asymmetrical bevels, with one inclined surface coated with an optically thin film supporting propagating plasmons and the other coated with a reflecting metal film. The angle of incident light can be readily tuned through modifying the beveled angles of the fiber tip, which has a remarkable impact on the refractive index sensitivity of SPR sensors. As a result, we measure a high refractive index sensitivity as large as 8161 nm/RIU in a wide refractive index range of 1.333–1.404 for the optimized sensor. Furthermore, we carry out a temperature-sensitivity measurement by packaging the SPR probe into a capillary filled with n-butanol. This showed a temperature sensitivity reaching up to −3.35 nm/°C in a wide temperature range of 20 °C–100 °C. These experimental results are well in agreement with those obtained from simulations, thus suggesting that our work may be of significance in designing reflective fiber optic SPR sensing probes with modified geometries. MDPI 2022-11-23 /pmc/articles/PMC9739012/ /pubmed/36501796 http://dx.doi.org/10.3390/s22239099 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Communication
Li, Lixia
Li, Yuli
Zong, Xueyang
Zhao, Linlin
Li, Penglei
Yu, Kun
Liu, Yufang
Wedged Fiber Optic Surface Plasmon Resonance Sensor for High-Sensitivity Refractive Index and Temperature Measurements
title Wedged Fiber Optic Surface Plasmon Resonance Sensor for High-Sensitivity Refractive Index and Temperature Measurements
title_full Wedged Fiber Optic Surface Plasmon Resonance Sensor for High-Sensitivity Refractive Index and Temperature Measurements
title_fullStr Wedged Fiber Optic Surface Plasmon Resonance Sensor for High-Sensitivity Refractive Index and Temperature Measurements
title_full_unstemmed Wedged Fiber Optic Surface Plasmon Resonance Sensor for High-Sensitivity Refractive Index and Temperature Measurements
title_short Wedged Fiber Optic Surface Plasmon Resonance Sensor for High-Sensitivity Refractive Index and Temperature Measurements
title_sort wedged fiber optic surface plasmon resonance sensor for high-sensitivity refractive index and temperature measurements
topic Communication
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9739012/
https://www.ncbi.nlm.nih.gov/pubmed/36501796
http://dx.doi.org/10.3390/s22239099
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