Wide-range temperature measurement using a right-angle plastic optical fiber SPR sensor

This paper proposes a temperature sensor based on surface plasmon resonance (SPR) technology utilizing a right-angle plastic optical fiber (POF). The sensor is fabricated by hot pressing the fiber to form two planar surfaces with a right-angle cross-section, on which Ag/PDMS composite films are deposited. Experimental results demonstrate that the sensor achieves a temperature sensitivity of up to -1.371nm/^∘C within a broad temperature range from -40^∘C to 96°C, which is superior to most existing fiber-optic temperature sensors. It also exhibits good repeatability and cycling stability during cooling/heating processes. The sensor is cost-effective and features a straightforward fabrication process, making it suitable for wide-range temperature-monitoring applications.