High sensitivity photonic crystal fiber temperature and refractive index sensor based on surface plasmon resonance

In this paper, a D-shaped open-ring photonic crystal fiber temperature sensor based on surface plasmon resonance is proposed and analyzed using the finite element method. The silver film is coated on the polished surface as a plasmonic excitation material and can effectively improve sensitivity. A mixture of ethanol and chloroform is used as a temperature-sensitive material to measure temperature. The simulation result shows that it can be detected to investigate the sensor performance in a range of temperatures from 0 to 60 °C. When the temperature is 20 °C, the sensor can detect the sensor performance in a range of refractive index from 1.33 to 1.40. The temperature sensor exhibits a maximum sensitivity of 6.1 nm/°C, a resolution of 1.63 × 10–3 °C with the adjusted R-square value of 0.9985. Due to the wide temperature detection range and high sensitivity, the proposed temperature sensor can be one of the significant potential candidates in the field of temperature sensing.