Dual-channel microfluidic sensor based on side-hole fiber with two long-period fiber gratings |
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| Authors: | Yu Zhang Yongzhi Li Chao Liu Zhihai Liu Yaxun Zhang Xinghua Yang Jianzhong Zhang Jun Yang Libo Yuan |
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| Affiliation: | (Key Laboratory of In-fiber Integrated Optics,Ministry of Education,Harbin Engineering University,Harbin 150001,China;National Demonstration Center for Experimental Physics Education,Harbin Engineering University,Harbin 150001,China;Photonics Research Center,Guilin University of Electronics Technology,Guilin 541004,China) |
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| Abstract: | We propose and demonstrate a dual-channel microfluidic sensor based on a side-hole fiber(SHF) with two longperiod 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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