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Open AccessArticle

Highly Sensitive Temperature Sensing Performance of a Microfiber Fabry-Perot Interferometer with Sealed Micro-Spherical Reflector

by Jin Li 1,2,3,*, Juntong Yang 2 and Jinna Ma 1
1
State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment, Shenzhen 518172, China
2
College of Information Science and Engineering, Northeastern University, Shenyang 110819, China
3
State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
*
Author to whom correspondence should be addressed.
Micromachines 2019, 10(11), 773; https://doi.org/10.3390/mi10110773
Received: 15 October 2019 / Revised: 10 November 2019 / Accepted: 11 November 2019 / Published: 12 November 2019
A temperature probe has been proposed by inserting a microfiber taper into a silica hollow core fiber with a microsphere end. The sealed air cavity in the microsphere and the inserted microfiber acted as the two reflectors of a Fabry-Perot interferometer, respectively. The contribution of both microfiber diameter and cavity length on the interference spectra was analyzed and discussed in detail. The temperature change was experimentally determined by monitoring the wavelength location of the special resonance dip. By filling the air cavity with poly-dimethylsiloxane (PDMS), a high temperature sensitivity of 3.90 nm/°C was experimentally demonstrated. This temperature probe with the diameter of 150 μm and length of 10 mm will be a promising candidate for exploring the miniature or implantable sensors. View Full-Text
Keywords: microfiber; integrated optics; fiber sensors; temperature sensors microfiber; integrated optics; fiber sensors; temperature sensors
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Li, J.; Yang, J.; Ma, J. Highly Sensitive Temperature Sensing Performance of a Microfiber Fabry-Perot Interferometer with Sealed Micro-Spherical Reflector. Micromachines 2019, 10, 773.

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