High-sensitivity PCF-SPR sensor with three-core structure for three-parameter sensing

This study introduces a novel photonic crystal fiber (PCF) refractive index-temperature (RI-T) sensor. It has an innovative three-core structure that forms three channels to achieve high sensitivity and accurate measurement of three parameters simultaneously. The independence of the three-channel sensing is experimentally verified.Simulation outcomes indicate that the dual-channel RI sensing achieves maximum detection ranges of 1.32-1.41 and 1.35-1.44, with a maximum wavelength sensitivity (WS) is 28300 RIU^-1. The maximum amplitude sensitivity (AS) is 15500 RIU^-1. Regarding temperature sensing, the sensor can detect 0°C- 90°C, the max WS is 7.8 nm/°C. In conclusion, the proposed PCF-SPR sensor can achieve precise measurements of solution concentration and environmental temperature.