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dc.contributor.authorQi, Yen_US
dc.contributor.authorZhao, Yen_US
dc.contributor.authorBao, HHen_US
dc.contributor.authorJin, Wen_US
dc.contributor.authorHo, HLen_US
dc.identifier.citationOptica, 20 May 2019, v. 6, no. 5, p. 570-576en_US
dc.description.abstractThe increasing importance of hydrogen as an energy carrier and industrial material calls for hydrogen sensors with higher sensitivity, better selectivity, faster response, and wider dynamic range. Here, we report a nanofiber (NF) sensor that satisfies these requirements with a single sensing element. The sensor is based on stimulated Raman scattering spectroscopy, but the tightly confined evanescent field associated with the NF enhances the Raman gain per unit length by a factor of 30 to 102 over the state-of-the-art hollow-core photonic crystal fibers and more than 104 over free-space beams. The NF has excellent mode quality, which ensures mode-noise-free measurement and maximizes the signal-to-noise ratio. An experiment with a 700-nm-diameter, 48-mm-long silica NF operating in the telecom wavelength band demonstrates hydrogen detection from a few parts per million to 100% with a response time less than 10 s. The sensor would be useful for a range of applications, including detection of hydrogen leakage as well as monitoring of battery charging, fuel cells, and electric power transformer health conditions.en_US
dc.description.sponsorshipChinese Mainland Affairs Officeen_US
dc.description.sponsorshipDepartment of Electrical Engineeringen_US
dc.publisherOptical Society of Americaen_US
dc.rights© 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement (
dc.rightsThe Author(s) agree that all copies of the Work made under any of the above rights shall prominently include the following copyright notice: “© 2019 Optical Society of America. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.en_US
dc.rightsThe following publication Yun Qi, Yan Zhao, Haihong Bao, Wei Jin, and Hoi Lut Ho, "Nanofiber enhanced stimulated Raman spectroscopy for ultra-fast, ultra-sensitive hydrogen detection with ultra-wide dynamic range," Optica 6, 570-576 (2019) is available at
dc.titleNanofiber enhanced stimulated Raman spectroscopy for ultra-fast, ultra-sensitive hydrogen detection with ultra-wide dynamic rangeen_US
dc.typeJournal/Magazine Articleen_US
dc.description.validate201907 bcrc-
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