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Sensors 2017, 17(12), 2862; https://doi.org/10.3390/s17122862

Two-Channel SPR Sensor Combined Application of Polymer- and Vitreous-Clad Optic Fibers

1
Key Laboratory of Intelligent Information Processing and Control, Chongqing Three Gorges University, Wanzhou, Chongqing 404100, China
2
College of Electronic & Information Engineering, Chongqing Three Gorges University, Chongqing 404100, China
3
Chongqing Engineering Research Center of Internet of Things and Intelligent Control Technology, Chongqing Three Gorges University, Chongqing 404100, China
4
Key Lab of In-fiber Integrated Optics, Ministry Education of China, Harbin Engineering University, Harbin 150001, China
5
Basic Medicine Department, Chongqing Three Gorges Medical College, Chongqing 404100, China
*
Author to whom correspondence should be addressed.
Received: 20 October 2017 / Revised: 26 November 2017 / Accepted: 5 December 2017 / Published: 9 December 2017
(This article belongs to the Section Physical Sensors)
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Abstract

By combining a polymer-clad optic fiber and a vitreous-clad optic fiber, we proposed and fabricated a novel optic fiber surface plasmon resonance (SPR) sensor to conduct two-channel sensing at the same detection area. The traditional optic fiber SPR sensor has many disadvantages; for example, removing the cladding requires corrosion, operating it is dangerous, adjusting the dynamic response range is hard, and producing different resonance wavelengths in the sensing area to realize a multi-channel measurement is difficult. Therefore, in this paper, we skillfully used bare fiber grinding technology and reverse symmetry welding technology to remove the cladding in a multi-mode fiber and expose the evanescent field. On the basis of investigating the effect of the grinding angle on the dynamic range change of the SPR resonance valley wavelength and sensitivity, we combined polymer-clad fiber and vitreous-clad fiber by a smart design structure to realize at a single point a two-channel measurement fiber SPR sensor. In this paper, we obtained a beautiful spectral curve from a multi-mode fiber two-channel SPR sensor. In the detection range of the refractive rate between 1.333 RIU and 1.385 RIU, the resonance valley wavelength of channel Ⅰ shifted from 622 nm to 724 nm with a mean average sensitivity of 1961 nm/RIU and the resonance valley wavelength of channel Ⅱ shifted from 741 nm to 976 nm with a mean average sensitivity of 4519 nm/RIU. View Full-Text
Keywords: fiber optic sensors; micro-optical devices; surface plasmon resonance; multi-channel SPR sensors fiber optic sensors; micro-optical devices; surface plasmon resonance; multi-channel SPR sensors
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Wei, Y.; Su, Y.; Liu, C.; Nie, X.; Liu, Z.; Zhang, Y.; Zhang, Y. Two-Channel SPR Sensor Combined Application of Polymer- and Vitreous-Clad Optic Fibers. Sensors 2017, 17, 2862.

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