Abstract:In this paper, we propose a photonic crystal fiber sensor based on the surface plasmonic resonance effect for simultaneous temperature and refractive index measurement. The coupling characteristics and sensing performance of the sensor are analyzed using the full vector finite element method. The sensor provides two channels for in-dependent measurement of refractive index and temperature. When operating independently, channel I supports y-polarized light with a sensitivity of up to 7000 nm/RIU for detecting refractive index, while channel II supports x-polarized light with a sensitivity of up to 16 nm/°C for detecting temperature. Additionally, we investigated the influence of gold layer thickness on the sensing performance to optimize the sensor's performance.