In-fiber Mach-Zehnder interferometer based on hollow optic fiber for metal ion detection

A new, to the best of our knowledge, in-fiber Mach–Zehnder interferometric sensor is proposed and experimentally demonstrated for detecting Cu 2+ ions in an aqueous environment. The sensor is fabricated simply and cost-effectively by arc-fusing a short section of hollow optical fiber between two sta...

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Bibliographic Details
Published inOptics express Vol. 30; no. 15; pp. 26006 - 26017
Main Authors Liu, Ming-Fu, Wang, Jia-Wei, Hwang, Shug-June
Format Journal Article
LanguageEnglish
Published 18.07.2022
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Summary:A new, to the best of our knowledge, in-fiber Mach–Zehnder interferometric sensor is proposed and experimentally demonstrated for detecting Cu 2+ ions in an aqueous environment. The sensor is fabricated simply and cost-effectively by arc-fusing a short section of hollow optical fiber between two standard single-mode fibers and is functionalized by depositing chitosan and poly(acrylic acid) bilayers using electrostatic self-assembly. The proposed sensor shows a linear response with sensitivity of 42 nm/mM in the Cu 2+ ion concentration from 0 to 40 µM. Moreover, the fiber sensor exhibits good reusability and repeatability and is a promising candidate for contamination detection in drinking water and industrial waste water.
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ISSN:1094-4087
1094-4087
DOI:10.1364/OE.459221