Abstract
A simple manufacturing method of highly sensitive optical fiber temperature sensor is presented in this paper. The device consists of an optical microfiber interferometer which is made of side-grooved optical microfiber taper (OMT) embedded in polydimethylsiloxane (PDMS) with high thermo-optic coefficient. This OMT with side grooves acts as a refractive index (RI) sensor. An interference pattern could be generated as a result of inter-mode interference whose evanescent waves have strong interaction with the external medium surrounding the tapered region. Selected interference dip was sensitive to the ambient RI and its sensitivity is up to 4096 nm/RIU in the range of 1.39500-1.40000. After the PDMS coating, the high thermooptic coefficient of the packaging material makes the sidegrooved OMT capable of temperature sensing with a sensitivity up to -5.56 nm/°C in the range of 25°C-40°C.
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