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In-line microfiber-assisted Mach-Zehnder interferometer for microfluidic highly sensitive measurement of salinity

Xie, Nanjie, Zhang, Hao, Liu, Bo, Liu, Haifeng, Liu, Ting, Wang, Chao (2018) In-line microfiber-assisted Mach-Zehnder interferometer for microfluidic highly sensitive measurement of salinity. IEEE Sensors Journal, . ISSN 1530-437X. (doi:10.1109/JSEN.2018.2869273)

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https://doi.org/10.1109/JSEN.2018.2869273

Abstract

We present a microfluidic U-shaped micro-cavity sensor by splicing a segment of microfiber of a few hundred micrometers in length tapered from a single-mode fiber (SMF) between two SMFs with predesigned lateral offset for highly sensitive salinity measurement. The proposed sensing probe serves as an in-line microfiber-assisted Mach-Zehnder interferometer (MAMZI) with an ultra-high refractive index sensitivity of 104 nm/RIU. Three Mach-Zehnder interferometer structures with different cavity lengths of 351.82 ?m, 242.56 ?m and 181.31 ?m are fabricated, by which microfluidic sensing systems are established for in-line measurement of sodium chloride (NaCl) solution. Experimental results indicate that the detection limit of NaCl solution is as low as 4×10-3 wt% and the response time is less than 15 s, which would make the MAMZI-based microfluidic measuring system play an important role in label-free biological and chemical detection applications.

Item Type: Article
DOI/Identification number: 10.1109/JSEN.2018.2869273
Uncontrolled keywords: Microfluidic sensing, Salinity sensor, Fiber-optic interferometer, Mach-Zehnder interferometer, Microfiber
Subjects: T Technology
T Technology > TK Electrical engineering. Electronics Nuclear engineering
T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5101 Telecommunications
T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5101 Telecommunications > TK5103.59 Optical communications, Fibre-optics
T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK8300 Optoelectronic devices
Divisions: Faculties > Sciences > School of Engineering and Digital Arts > Broadband & Wireless Communications
Depositing User: Chao Wang
Date Deposited: 12 Sep 2018 21:51 UTC
Last Modified: 05 Sep 2019 23:00 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/69087 (The current URI for this page, for reference purposes)
Wang, Chao: https://orcid.org/0000-0002-0454-8079
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