基于光子晶体光纤的生物质量浓度与温度双参量传感

Biological Mass Concentration and Temperature Dual Parametric Sensing Based on Photonic Crystal Fiber

提出了一种基于表面等离子体共振和定向耦合效应的D型光子晶体光纤生物双参量传感结构。首先,用光子晶体光纤纤芯与金属膜层之间的表面等离子体共振效应检测生物液体的质量浓度。然后,用光子晶体光纤纤芯与缺陷芯之间的定向耦合效应和温敏材料的温敏效应作为温度传感机制测量环境温度。最后,用COMSOL Multiphysics有限元软件建立光子晶体光纤传感结构模型并进行数值分析。结果表明,基于表面等离子体共振的质量浓度传感和基于定向耦合的温度传感相互独立,该传感器在34.6~186.7 mg/mL人血清白蛋白质量浓度范围内的灵敏度可达5.44 nm/(mg·mL^(-1)),在20~45℃温度范围内的灵敏度可达17.3 nm/℃。

A biological dual parametric sensing structure of D-type photonic crystal fiber based on surface plasmon resonance and directional coupling effects is presented in this paper.First,the surface plasmon resonance effect between the core of photonic crystal fiber and the metal film layer is used to detect the mass concentration of the biological liquid.Then,the directional coupling effect between the core of photonic crystal fiber and the defective core and the temperaturesensitive effect of the temperature-sensitive material are used as the temperature sensing mechanism to measure the ambient temperature.Finally,the photonic crystal fiber sensing structure model is established and numerically analyzed by the finite element software COMSOL Multiphysics.The results show that the mass concentration sensing based on surface plasmon resonance and temperature sensing based on directional coupling are independent of each other.The sensitivity of the sensor can reach 5.44 nm/(mg·mL^(−1))in the concentration range of 34.6-186.7 mg/mL human serum albumin,and the sensitivity can reach 17.3 nm/℃ in the temperature range of 20-45℃.