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
- 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
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.