期刊
CHINESE OPTICS LETTERS
卷 18, 期 2, 页码 -出版社
OSA-OPTICAL SOC
DOI: 10.3788/COL202018.020601
关键词
long-period grating; optical fiber sensor; refractive index measurement
类别
资金
- National Key R&D Program of China [2018YFC1503703]
- National Natural Science Foundation of China [61975039, 61675053, 61775047, 61705051]
- 111 Project [B13015]
- Fundamental Research Funds for Harbin Engineering University of 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.
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