Ultrasensitive temperature sensor based on an isopropanol-sealed optical microfiber taper

Abstract

We demonstrate an ultrasensitive temperature sensor based on an isopropanol-sealed optical microfiber taper (OMT) in a capillary. The OMT is highly sensitive to ambient refractive index (RI) with a maximum sensitivity of $18989\mathrm{nm}/\mathrm{RI}$ unit in the range of 1.3955–1.4008. The thermo-optic effect of isopropanol and the thermal expansions of the sealant and sealed liquid turn the OMT into an ultrasensitive temperature sensor with the maximum sensitivity of $-3.88\mathrm{nm}/°\mathrm{C}$ in the range of 20°C–50°C. The temperature sensitivity contributions from different mechanisms are also investigated theoretically and experimentally.

© 2013 Optical Society of America

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