Photonics Research, Volume. 7, Issue 7, 792(2019)
Nanoliter liquid refractive index sensing using a silica V-groove fiber interferometer
Fig. 1. (a) Proposed refractive index sensor structure. The input single-mode fiber (SMF) was fusion spliced to V-groove fiber (VGF) where MMI occurred. The MMI spectrum is transmitted through the output SMF. The liquid droplet was dispensed over the VGF, and the spectral shift caused by the RI change in the surrounding medium was measured. (b) Cross-sectional microphotograph of the fabricated VGF used in the experiments; (c) schematic process to make the VGF.
Fig. 2. (a) Schematic cross-sectional view of the VGF in simulations; (b)–(h) guide modes along the V-groove fiber and their intensity distribution at
Fig. 3. (a) Impacts of
Fig. 4. Schematic view of the RI sensing based on an SVS structure. Here ASE is the amplified spontaneous emission light source; OSA is the optical spectrum analyzer. SVS stands for SMF-VGF-SMF structure.
Fig. 5. (a) Transmission spectra through the proposed sensor for various ethanol concentrations in the aqueous solution. (b) Shift of the spectral dip for various ethanol concentrations. (c) Spectral shift versus the RI of the solution.
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Quan Chai, Hyeonwoo Lee, Seongjin Hong, Yongsoo Lee, Junbum Park, Jianzhong Zhang, Kyunghwan Oh. Nanoliter liquid refractive index sensing using a silica V-groove fiber interferometer[J]. Photonics Research, 2019, 7(7): 792
Category: Optical Devices
Received: Nov. 14, 2018
Accepted: May. 11, 2019
Published Online: Jun. 21, 2019
The Author Email: Kyunghwan Oh (koh@yonsei.ac.kr)