基于SPR效应的金-PDMS涂覆光子晶体光纤高灵敏度温度测量

通过在光子晶体光纤(PCF)包层外侧填镀金纳米膜及PDMS温敏薄膜,设计了一种基于表面等离子体共振(SPR)效应的高灵敏度温度传感器,具有结构简单、工艺成熟、可逆性好的优点。PDMS的有效折射率会随温度的增加而减小,从而引起纤芯模式的损耗峰向短波方向移动。在完全匹配层边界条件下,利用全矢量有限元法分析SPR-PCF的损耗谱特性,实现了温度的高灵敏度精确快速测量。在22~47℃的温度范围内,所提传感器的温度灵敏度可达到-8.18 nm/℃,这种传感测量方法能拓展应用于各类安全检测和智能监测领域。

High-Sensitivity Temperature Measurement Based on SPR in Gold-PDMS-Coated Photonic Crystal Fiber

In this study,a high-sensitivity temperature sensor based on surface plasmon resonance(SPR)is designed by plating gold thin layer and PDMS temperature-sensitive film onto the outer layer of photonic crystal fiber(PCF).It has the advantages of a simple structure,mature process,and good reversibility.The refractive index of PDMS decreases with the increase in temperature,causing the loss peak of the core mode to move toward the short-wave direction.The full-vector finite element method is used to analyze the SPR-PCF loss spectral characteristics under the condition of a perfectly matched layer boundary,which can achieve highly sensitive and accurate temperature measurements.The temperature sensitivity of the proposed sensor has been observed to reach-8.18 nm/℃within the temperature range of 22--47℃.Furthermore,the proposed measurement method is applicable in safety detection and intelligent monitoring fields.