Abstract

An ultracompact microfiber sensor head is demonstrated for refractive index and high temperature sensing. Such a device is a fiber in-line Mach–Zehnder interferometer formed by creating an inner air-cavity along a section of microfiber and exhibits a high refractive index sensitivity of ∼4202 nm/refractive index unit and a good temperature sensitivity of 41 pm/°C, with excellent high-temperature sustainability up to 1100 °C.

© 2014 IEEE

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