High-sensitivity fiber optic temperature sensors are essential analytical tools in biological and chemical fields. To increase the temperature sensitivity of the surface plasmon resonance sensors, we decide to employ a stable material, Ge₂Sb₂Te₅ (GST). When GST is deposited on the gold film's surface, SPR is excited at lower frequency, this indicates that the resonance dips are red-shifted. At long wavelengths, the evanescent field is greatly enhanced, and the penetration depth is increased, which increases the interaction volume. In other words, the sensitivity is greatly improved. The fiber optic is encapsulated in cyclohexane with a high thermo-optic coefficient and a high refractive index. The sensitivity improves further because the fiber is placed in a high refractive index environment. The sensor's average temperature sensitivity is 14.7 nm/°C, with a measurement range of 5 °C to 80 °C, according to the output spectra. The maximum temperature sensitivity can reach 25.7 nm/°C. As a result, the suggested temperature sensor might be useful in various industries that need high measurement precision.

高灵敏度光纤温度传感器是生物和化学领域必不可少的分析工具。为了提高表面等离子共振传感器的温度灵敏度，我们决定采用稳定的材料 Ge ₂ Sb ₂ Te ₅（消费税）。当 GST 沉积在金膜表面时，SPR 在较低频率下被激发，这表明共振谷发生了红移。在长波长处，倏逝场大大增强，穿透深度增加，从而增加了相互作用体积。换言之，灵敏度大大提高。光纤封装在具有高热光系数和高折射率的环己烷中。由于光纤放置在高折射率环境中，因此灵敏度进一步提高。根据输出光谱，传感器的平均温度灵敏度为 14.7 nm/°C，测量范围为 5 °C 至 80 °C。最高温度灵敏度可达 25.7 nm/°C。因此，