Compact Fabry-Perot microfiber interferometer temperature probe with closed end face

In this paper, a Fabry-Pe ' rot interferometer microprobe was constructed based on microfiber taper and hollow microfiber cone cavity. The interference cavity length of the Fabry-Pe ' rot structure can be flexibly changed by moving the microfiber taper in the hollow microfiber. Polydimethylsiloxane solution was filled into the air cavity of the Fabry-Pe ' rot interferometer to build a Fabry-Pe ' rot temperature-sensitive microprobe with a stable structure by coaxially fixing the microfiber taper in the hollow fiber. The temperature sensitivity reached up to 2.41 nm/ degrees C. The triple-repeated measurements and stability tests were experimentally verified with an excellent sensing performance. This small, compact, and end-sealed temperature-sensitive probe will push forward the development of wearable or implantable sensors.