A highly sensitive dual-core PCF-SPR sensor based on ITO and Au for detecting refractive index and temperature

Abstract Sensors have been instrumental in driving technological progress and enhancing quality of life by delivering precise data and enabling intelligent responses across a multitude of disciplines. In alignment with the advancement of technology and the demands of both industrial production and everyday life, a dual-core PCF-SPR sensor was developed. The sensor, based on D-type photonic crystal fiber and incorporating ITO and Au, was designed for the simultaneous detection of refractive index and temperature. Research results demonstrate that by using the finite element method, the maximum sensitivity of the structure in the refractive index detection range of 1.33-1.39 reached 18,100 nm/RIU, and the maximum sensitivity in the temperature detection range of 10 °C-50 °C reached －12.3 nm/°C. The refractive index and temperature detection channels operate independently of each other. This sensor architecture enables simultaneous dual-parameter measurement of refractive index and temperature, is lightweight and highly sensitive, and possesses potential applications in cancer cell detection and tsunami prevention.