Chinese Optics Letters, 2020, Vol. 18, Issue 2, pp.
Dual-channel microfluidic sensor based on side-hole fiber with two long-period fiber grating
Zhang Yu, Li Yongzhi, Liu Chao, Liu Zhihai, Zhang Yaxun, Yang Xinghua, Zhang Jianzhong, Yang Jun, Yuan Libo
- Haerbin Engineering University
- Harbin Engineering University
- 哈尔滨 哈尔滨工程大学理学院
We propose and demonstrate a dual-channel microfluidic sensor based a side-hole fiber (SHF) with two long-period fiber grating (LPFG) structures. There are two air holes in the SHF, which are nature microfluidic channels. We fabricate two LPFG (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 sensitivity 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.