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A Polarization-Independent Fiber-Optic SPR Sensor

Fiber-optic surface plasmon resonance (SPR) sensors possess the advantages of small size, flexible, allowing for a smaller sample volume, easy to be integrated, and high sensitivity. They have been intensively developed in recent decades. However, the polarizing nature of the surface plasmon waves (...

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Autores principales: Li, Songquan, Gao, Laixu, Zou, Changwei, Xie, Wei, Wei, Yong, Tian, Canxin, Wang, Zesong, Liang, Feng, Xiang, Yanxiong, Yang, Qian
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6209958/
https://www.ncbi.nlm.nih.gov/pubmed/30248984
http://dx.doi.org/10.3390/s18103204
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author Li, Songquan
Gao, Laixu
Zou, Changwei
Xie, Wei
Wei, Yong
Tian, Canxin
Wang, Zesong
Liang, Feng
Xiang, Yanxiong
Yang, Qian
author_facet Li, Songquan
Gao, Laixu
Zou, Changwei
Xie, Wei
Wei, Yong
Tian, Canxin
Wang, Zesong
Liang, Feng
Xiang, Yanxiong
Yang, Qian
author_sort Li, Songquan
collection PubMed
description Fiber-optic surface plasmon resonance (SPR) sensors possess the advantages of small size, flexible, allowing for a smaller sample volume, easy to be integrated, and high sensitivity. They have been intensively developed in recent decades. However, the polarizing nature of the surface plasmon waves (SPWs) always hinders the acquisition of SPR spectrum with high signal-noise ratio in wavelength modulation unless a polarizer is employed. The addition of polarizer complicates the system and reduces the degree of compactness. In this work, we propose and demonstrate a novel, polarization-independent fiber-optic SPR sensor based on a BK7 bi-prism with two incident planes orthogonal to each other. In the bi-prism, TM-polarized components of non-polarized incident lights excite SPWs on the first sensing channel, meanwhile the TE components and the remaining TM components are reflected, then the reflected TE components serve as TM components of incident lights for the second sensing channel to excite SPWs. Simulations show the proposed SPR structure permit us to completely eliminate the polarization dependence of the plasmon excitation. Experimental results agree well with the simulations. This kind of devices can be considered an excellent option for development of simple and compact SPR chemical sensors.
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spelling pubmed-62099582018-11-02 A Polarization-Independent Fiber-Optic SPR Sensor Li, Songquan Gao, Laixu Zou, Changwei Xie, Wei Wei, Yong Tian, Canxin Wang, Zesong Liang, Feng Xiang, Yanxiong Yang, Qian Sensors (Basel) Letter Fiber-optic surface plasmon resonance (SPR) sensors possess the advantages of small size, flexible, allowing for a smaller sample volume, easy to be integrated, and high sensitivity. They have been intensively developed in recent decades. However, the polarizing nature of the surface plasmon waves (SPWs) always hinders the acquisition of SPR spectrum with high signal-noise ratio in wavelength modulation unless a polarizer is employed. The addition of polarizer complicates the system and reduces the degree of compactness. In this work, we propose and demonstrate a novel, polarization-independent fiber-optic SPR sensor based on a BK7 bi-prism with two incident planes orthogonal to each other. In the bi-prism, TM-polarized components of non-polarized incident lights excite SPWs on the first sensing channel, meanwhile the TE components and the remaining TM components are reflected, then the reflected TE components serve as TM components of incident lights for the second sensing channel to excite SPWs. Simulations show the proposed SPR structure permit us to completely eliminate the polarization dependence of the plasmon excitation. Experimental results agree well with the simulations. This kind of devices can be considered an excellent option for development of simple and compact SPR chemical sensors. MDPI 2018-09-22 /pmc/articles/PMC6209958/ /pubmed/30248984 http://dx.doi.org/10.3390/s18103204 Text en © 2018 by the authors. 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 (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Letter
Li, Songquan
Gao, Laixu
Zou, Changwei
Xie, Wei
Wei, Yong
Tian, Canxin
Wang, Zesong
Liang, Feng
Xiang, Yanxiong
Yang, Qian
A Polarization-Independent Fiber-Optic SPR Sensor
title A Polarization-Independent Fiber-Optic SPR Sensor
title_full A Polarization-Independent Fiber-Optic SPR Sensor
title_fullStr A Polarization-Independent Fiber-Optic SPR Sensor
title_full_unstemmed A Polarization-Independent Fiber-Optic SPR Sensor
title_short A Polarization-Independent Fiber-Optic SPR Sensor
title_sort polarization-independent fiber-optic spr sensor
topic Letter
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6209958/
https://www.ncbi.nlm.nih.gov/pubmed/30248984
http://dx.doi.org/10.3390/s18103204
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