用于接触式探测的多模光纤探针形状优化

Collectable optical power of various specially shaped multimode optical fiber probes for contact sensing

对于进行接触式探测的多模光纤探针,信号光来自于附着于探针表面的待测物。基于几何光学,提出了一个物理模型,用以分析探头形状对所收集的信号光强度的影响。采用此模型,对抛物线型探头进行了仿真,给出了最优形状参数,并采用表面增强拉曼探针进行了初步实验验证。此分析可用于指导各种光纤传感器的设计,以确定其最佳的形状参数,适用于荧光传感器、表面等离子体共振传感器、表面增强拉曼传感器等。

A theoretical analysis is presented, evaluating the total collectable optical power of an arbitrarily shaped multimode optical fiber probe for contact sensing where the signal from the analyte is emitted or scattered on the outside surface of the fiber tip. Calculation results and optimization parameters are given for spherical fiber probes. Based on surface enhanced Raman sensors, validating experiment results for spherical fiber probes are presented and di^ussed. This analysis can be used to guide the design and optimization of various fiber sensors, including fluorescence, surface plasmon resonance, and surface enhanced Raman sensors.