title: Temperature-insensitive refractive index sensing by use of micro Fabry-Pérot cavity based on simplified hollow-core photonic crystal fiber.
abstract: A temperature-insensitive micro Fabry-Pérot (FP) cavity based on simplified hollow-core (SHC) photonic crystal fiber (PCF) is demonstrated. Such a device is fabricated by splicing a section of SHC PCF with single mode fibers at both cleaved ends. An extremely low temperature sensitivity of ~0.273 pm/°C is obtained between room temperature and 900°C. By drilling vertical micro-channels using a femtosecond laser, the micro FP cavity can be filled with liquids and functions as a sensitive refractometer and the refractive index sensitivity obtained is ~851.3 nm/RIU (refractive index unit), which indicates an ultra low temperature cross-sensitivity of ~3.2×10(-7) RIU/°C.
authors: Department of Electrical Engineering, The Hong Kong Polytechnic University, Hong Kong, China.
authors: Ying
authors: Y
authors: Wang
authors: D N
authors: DN
authors: Wang
authors: C R
authors: CR
authors: Liao
authors: Tianyi
authors: T
authors: Hu
authors: Jiangtao
authors: J
authors: Guo
authors: Huifeng
authors: H
authors: Wei