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Sensors 2017, 17(10), 2403; https://doi.org/10.3390/s17102403

Investigation of Temperature Sensitivity of a Polymer-Overlaid Microfiber Mach-Zehnder Interferometer

Department of Physics and the Research Institute for Natural Sciences, Hanyang University, Seoul 133–791, Korea
Received: 21 September 2017 / Revised: 12 October 2017 / Accepted: 18 October 2017 / Published: 21 October 2017
(This article belongs to the Special Issue Optical Sensors based on Micro/Nanofibres)
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Abstract

The temperature sensitivity of the free spectral range (FSR) for a polymer-overlaid microfiber Mach-Zehnder interferometer (MZI) is investigated both theoretically and experimentally. The waist diameter of the optical microfiber can be controlled to alter the thermal expansion and optic properties of the polymer-coated MZI. Inserting an optical microfiber with a strong evanescent field into the MZI, a low index polymer with high thermal characteristics is deposited on the surface of the microfibers to realize a polymer-overlaid microfiber MZI. It was found that the thermal expansion factor in the proposed MZI plays an important role in the temperature sensitivity of the FSR. The temperature sensitivity of the polymer-overlaid microfiber MZI is improved, which is measured to be −8.29 nm/°C at 25 °C. The optical transmission spectrum of the polymer-overlaid microfiber MZI is converted to the spatial frequency spectrum via fast Fourier transform. The temperature sensitivity of the spatial frequency in the proposed polymer-overlaid MZI is estimated to be 18.31 pm−1 °C−1, which is 17 times higher than that of the microfiber MZI without polymer coating (1.04 pm−1 °C−1). View Full-Text
Keywords: microfibers; microfiber Mach-Zehnder interferometers; thermal expansion effect; thermo-optic effect; temperature sensors microfibers; microfiber Mach-Zehnder interferometers; thermal expansion effect; thermo-optic effect; temperature sensors
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Han, Y.-G. Investigation of Temperature Sensitivity of a Polymer-Overlaid Microfiber Mach-Zehnder Interferometer. Sensors 2017, 17, 2403.

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