PMMA-rod-assisted temperature sensor based on a two-turn thick-microfiber resonator

Abstract

We demonstrate a simple temperature sensor based on an optical microfiber coil resonator which is wrapped on a PMMA rod and embedded in Teflon. The microfiber is thick, strong and easy to be handled, which is 4~5 μm in diameter and more than 1 cm in waist region length. The PMMA rod has a diameter of ~2 mm. The temperature sensitivity is ~80 pm/°C thanks to the large thermal expansion coefficient of PMMA.