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Dual-channel fiber-optic surface plasmon resonance sensor with cascaded coaxial dual-waveguide D-type structure and microsphere structure |
| Ling-Ling Li(李玲玲)1, Yong Wei(魏勇)1,†, Chun-Lan Liu(刘春兰)1, Zhuo Ren(任卓)1, Ai Zhou(周爱)2, Zhi-Hai Liu(刘志海)3, and Yu Zhang(张羽)3 |
1 College of Electronic&Information Engineering, Chongqing Three Gorges University, Chongqing 404100, China;
2 National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Wuhan 430070, China;
3 Key Laboratory of In-fiber Integrated Optics, Ministry of Education of China, Harbin Engineering University, Harbin 150001, China |
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Abstract To address the restriction of fiber-optic surface plasmon resonance (SPR) sensors in the field of multi-sample detection, a novel dual-channel fiber-optic SPR sensor based on the cascade of coaxial dual-waveguide D-type structure and microsphere structure is proposed in this paper. The fiber sidepolishing technique converts the coaxial dual-waveguide fiber into a D-type one, and the evanescent wave in the ring core leaks, generating a D-type sensing region; the fiber optic fused ball push technology converts the coaxial dual waveguides into microspheres, and the stimulated cladding mode evanescent wave leaks, producing the microsphere sensing region. By injecting light into the coaxial dual-waveguide middle core alone, the sensor can realize single-stage sensing in the microsphere sensing area; it can also realize dual-channel sensing in the D-type sensing area and microsphere sensing area by injecting light into the ring core. The refractive index measurement ranges for the two channels are 1.333-1.365 and 1.375-1.405, respectively, with detection sensitivities of 981.56 nm/RIU and 4138 nm/RIU. The sensor combines wavelength division multiplexing and space division multiplexing technologies, presenting a novel research concept for multi-channel fiber SPR sensors.
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Received: 08 July 2022
Revised: 28 September 2022
Accepted manuscript online: 27 October 2022
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PACS:
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07.07.Df
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(Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing)
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42.81.Cn
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(Fiber testing and measurement of fiber parameters)
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71.45.Gm
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(Exchange, correlation, dielectric and magnetic response functions, plasmons)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61705025), the Natural Science Foundation of Chongqing (Grant Nos. cstc2019jcyjmsxmX043 and cstc2018jcyjAX0817), the Fund from the Science and Technology Project Affiliated to the Education Department of Chongqing Municipality (Grant Nos. KJQN201801217, KJQN202001214, KJQN201901226, and KJ1710247), the Fund from Chongqing Key Laboratory of Geological Environment Monitoring and Disaster Early-Warning in Three Gorges Reservoir Area (Grant Nos. ZD2020A0103 and ZD2020A0102), and the Fundamental Research Funds for Chongqing Three Gorges University of China (Grant No. 19ZDPY08). |
Corresponding Authors:
Yong Wei
E-mail: weiyong@hrbeu.edu.cn
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Cite this article:
Ling-Ling Li(李玲玲), Yong Wei(魏勇), Chun-Lan Liu(刘春兰), Zhuo Ren(任卓), Ai Zhou(周爱), Zhi-Hai Liu(刘志海), and Yu Zhang(张羽) Dual-channel fiber-optic surface plasmon resonance sensor with cascaded coaxial dual-waveguide D-type structure and microsphere structure 2023 Chin. Phys. B 32 020702
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