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  • Received: Sep. 16, 2019

    Accepted: Nov. 1, 2019

    Posted: Dec. 26, 2019

    Published Online: Dec. 30, 2019

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    DOI: 10.3788/COL202018.020601

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    Yu Zhang, Yongzhi Li, Chao Liu, Zhihai Liu, Yaxun Zhang, Xinghua Yang, Jianzhong Zhang, Jun Yang, Libo Yuan. Dual-channel microfluidic sensor based on side-hole fiber with two long-period fiber gratings[J]. Chinese Optics Letters, 2020, 18(2): 020601

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Chinese Optics Letters, Vol. 18, Issue 2, 020601 (2020)

Dual-channel microfluidic sensor based on side-hole fiber with two long-period fiber gratings

Yu Zhang1, Yongzhi Li1, Chao Liu1, Zhihai Liu1,2,*, Yaxun Zhang1,**, Xinghua Yang1, Jianzhong Zhang1, Jun Yang1, and Libo Yuan3

Author Affiliations

  • 1Key Laboratory of In-fiber Integrated Optics, Ministry of Education, Harbin Engineering University, Harbin 150001, China
  • 2National Demonstration Center for Experimental Physics Education, Harbin Engineering University, Harbin 150001, China
  • 3Photonics Research Center, Guilin University of Electronics Technology, Guilin 541004, China

Abstract

We propose and demonstrate a dual-channel microfluidic sensor based on a side-hole fiber (SHF) with two long-period fiber grating (LPFG) structures. There are two air holes in the SHF, which are natural microfluidic channels. We fabricate two LPFGs (long-period gratings LPG-A and LPG-B) in the SHF with the resonance wavelengths of 1268.7 nm and 1385.8 nm, respectively. Results show that the refractive index sensitivities of LPG-A and LPG-B are ?76.0 nm/RIU and ?71.1 nm/RIU, respectively. One can measure the refractive index of liquid samples in two channels simultaneously. The proposed dual-channel microfluidic sensor has advantages of good linearity response, fluidic technology compatibility, and easy light input/output coupling and system integration, which helps the sensor to have a potential application in environmental detection and food safety detection.

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