Temperature Sensor Based on Quantum Dots Solution Encapsulated in Photonic Crystal Fiber

A luminescence temperature sensor was proposed based on quantum dots aqueous solution encapsulated in a photonic crystal fiber and sandwich structure by fusion splicing two multimode fibers end-to-end. The relationships of the luminescent peak, intensity, and full-width at half-maximum (FWHM) of the luminescent emission band with the temperature are investigated. A self-referenced method is used to optimize the relationship between intensity and temperature. The experimental results indicate that the sensitivities are 130.9pm/°C, 67pm/°C and -0.008/°C, respectively, with favorable repeatability for the luminescent peak, the FWHM, and the self-referenced intensity in the temperature range from -10 °C to 120 °C.