Photonic crystal fiber in-line Mach-Zehnder interferometer for explosive detection

Optics Express
Chuanyi TaoWenlin Feng

Abstract

We report a photonic crystal fiber (PCF) in-line Mach-Zehnder interferometer used as a gas sensor device which exhibits high sensitivity to the explosive trinitrotoluene (TNT). The interferometric sensor head is formed by embedding a segment of large-mode-area/grapefruit PCF between standard single-mode fibers via butt coupling, which produces two small air gaps in between terminated fiber ends with ceramic ferrule connectors as coupling regions, which also serve as inlet/outlet for the gas. The spectral response of the interferometer is investigated in terms of its wavelength spectrum. The selectivity to TNT vapor is achieved by immobilizing a molecular recognition ployallylamine layer on the inner surface of the holey region of the PCF. The TNT-induced variations of the interference fringes are measured and the sensing capability of the proposed sensor is demonstrated experimentally.

References

Sep 18, 2007·Journal of Biomedical Optics·Jian SunPing Shum
Jun 11, 2008·Optics Express·Ian M White, Xudong Fan
Apr 30, 2007·Optics Express·Hae Young ChoiByeong Ha Lee
Jan 24, 2012·Talanta·J Sarah CaygillSeamus P J Higson
Jun 22, 2013·Optics Express·Sahar Hosseinzadeh KassaniKyunghwan Oh
Jan 31, 2015·Biosensors & Bioelectronics·Qian ZhangQingjun Liu
Sep 24, 2015·Analytica Chimica Acta·Aron HakonenMikael Käll

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