Optical Fiber Cladding SPR Sensor Based on Core-Shift Welding Technology

Yong Wei; Jiangxi Hu; Ping Wu; Yudong Su; Chunlan Liu; Shifa Wang; Xiangfei Nie; Lu Liu

doi:10.3390/s19051202

Sensors (Mar 2019)

Optical Fiber Cladding SPR Sensor Based on Core-Shift Welding Technology

Yong Wei,
Jiangxi Hu,
Ping Wu,
Yudong Su,
Chunlan Liu,
Shifa Wang,
Xiangfei Nie,
Lu Liu

Affiliations

Yong Wei: Chongqing Municipal Key Laboratory of Intelligent Information Processing and Control of Institutions of Higher Education, Chongqing Three Gorges University, Chongqing 404100, China
Jiangxi Hu: College of Electronic & Information Engineering, Chongqing Three Gorges University, Chongqing 404100, China
Ping Wu: College of Electronic & Information Engineering, Chongqing Three Gorges University, Chongqing 404100, China
Yudong Su: College of Electronic & Information Engineering, Chongqing Three Gorges University, Chongqing 404100, China
Chunlan Liu: Chongqing Engineering Research Center of Internet of Things and Intelligent Control Technology, Chongqing Three Gorges University, Chongqing 404100, China
Shifa Wang: College of Electronic & Information Engineering, Chongqing Three Gorges University, Chongqing 404100, China
Xiangfei Nie: College of Electronic & Information Engineering, Chongqing Three Gorges University, Chongqing 404100, China
Lu Liu: Department of Physics, Harbin Institute of Technology, Harbin 150001, China

DOI: https://doi.org/10.3390/s19051202
Journal volume & issue: Vol. 19, no. 5
p. 1202

Abstract

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The typical structure of an optical fiber surface plasmon resonance (SPR) sensor, which has been widely investigated, is to produce the SPR phenomenon by the transmission of light in a fiber core. The traditional method is to peel off the fiber cladding by complex methods such as corrosion, polishing, and grinding. In this paper, the transmitted light of a single-mode fiber is injected into three kinds of fiber cladding by core-shift welding technology to obtain the evanescent field directly between the cladding and the air interface and to build the Kretschmann structure by plating with a 50-nm gold film. The SPR sensing phenomenon is realized in three kinds of fiber cladding of a single-mode fiber, a graded-index multimode fiber, and a step-index multimode fiber. For the step-index multimode fiber cladding SPR sensor, all the light field energy is coupled to the cladding, leading to no light field in the fiber core, the deepest resonance valley, and the narrowest full width at half maximum. The single-mode fiber cladding SPR sensor has the highest sensitivity, and the mean sensitivity of the probe reaches 2538 nm/RIU (refractive index unit) after parameter optimization.

Published in Sensors

ISSN: 1424-8220 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Chemical technology
Website: http://www.mdpi.com/journal/sensors

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