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基于表面等离子体共振(SPR)效应,设计了一种采用双芯结构光子晶体光纤(PCF)作为光波导的横向应力传感器。通过建立SPR耦合波模型和PCF结构的形变模型,利用全矢量有限元法进行数值模拟,获得了基模共振峰的偏移量与横向应力的关系。结果表明共振峰波长的偏移量与所施加应力具有很好的线性关系。对PCF的截面结构进行优化设计,通过选择适当的空气孔层数、直径和周期,可获得较高的测量灵敏度。该研究可为基于SPR的PCF横向应力传感器的设计提供理论依据。
Based on the surface plasmon resonance (SPR) effect, a transverse stress sensor based on PCF (double-core structure photonic crystal fiber) is designed. Through the establishment of the deformation model of the SPR coupled wave model and the PCF structure, the full-vector finite element method is used to conduct the numerical simulation. The relationship between the offset of the fundamental mode resonance peak and the transverse stress is obtained. The results show that there is a good linear relationship between the shift of the resonance wavelength and the applied stress. The PCF cross-sectional structure of the optimal design, by selecting the appropriate air hole layer number, diameter and period, can obtain higher measurement sensitivity. This study can provide a theoretical basis for the design of SPF-based PCF lateral stress sensors.