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A Polarization-Independent Fiber-Optic SPR Sensor

1
College of physical Science & Technology, Lingnan Normal University, Zhanjiang 524048, China
2
College of Electronic & Information Engineering, Chongqing Three Gorges University, Chongqing 404100, China
*
Author to whom correspondence should be addressed.
Sensors 2018, 18(10), 3204; https://doi.org/10.3390/s18103204
Received: 18 August 2018 / Revised: 17 September 2018 / Accepted: 20 September 2018 / Published: 22 September 2018
(This article belongs to the Special Issue Surface Plasmon Resonance Sensing 2019)
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Abstract

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. View Full-Text
Keywords: Fiber optics sensors; surface plasmon resonance; polarization-independent; bi-prism Fiber optics sensors; surface plasmon resonance; polarization-independent; bi-prism
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Li, S.; Gao, L.; Zou, C.; Xie, W.; Wei, Y.; Tian, C.; Wang, Z.; Liang, F.; Xiang, Y.; Yang, Q. A Polarization-Independent Fiber-Optic SPR Sensor. Sensors 2018, 18, 3204.

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