设计了一种用于同时检测甲烷和氢气的基于表面等离子体共振(SPR)的新型光子准晶体光纤(PQF)传感器。在该传感器中，在银膜上分别沉积Pd-WO₃和掺杂聚硅氧烷的笼型分子E薄膜作为氢气和甲烷的敏感材料。采用全矢量有限元方法对PQF-SPR传感器进行数值分析，结果证明该传感器具有良好的传感性能。在0%~3.5%的浓度范围内，氢气的最大检测灵敏度和平均灵敏度分别为0.8 nm/%和0.65 nm/%，甲烷的最大灵敏度和平均灵敏度分别为10 nm/%和8.81 nm/%。该传感器具有同时检测多种气体的能力，在设备小型化和远程监测方面具有很大的潜力。

为实现可调谐的多重Fano共振特性及设计高灵敏度折射率传感器，本文提出一种纳米环-七聚体金属-介电纳米天线结构，利用有限元方法（Finite Element Method, FEM）研究了Fano共振特性的影响因素和变化规律。研究表明，纳米环-七聚体金属-介电纳米天线的Fano共振特性对高度、入射角度和结构间隙的变化非常敏感；纳米天线的电场强度和电偶极源激发下的珀赛尔系数（Purcell factor, PF）可达134.74 V/m和3214，使得纳米天线中心位置附近的电场强度得到大幅增强；复合纳米天线结构具有较高的灵敏度S和品质因数FOM，分别为1400 nm/RIU和17 RIU⁻¹，可作为评价高灵敏度折射率传感器的重要性能指标。本文为实现复合纳米天线结构中Fano共振的可调谐特性提供了一种可行途径，为表面增强拉曼散射、量子发射器和折射率传感器等实际应用奠定了坚实的理论基础。

设计并分析了一种高灵敏度表面等离子体共振(SPR)传感器，该传感器由偏芯D型结构的十重光子准晶光纤(PQF)组成，并局部涂覆氧化铟锡(ITO)。偏芯D型结构可以使液体分析更加方便，增强了纤芯模与SPP模之间的耦合，提高了传感灵敏度。采用有限元法对传感器的特性进行研究。结果表明，传感器的波长灵敏度随折射率(RIs)的增大而增大，最大波长灵敏度和分辨率分别为60000 nm/RIU和1.67×10⁻⁶ RIU。该传感器性能优良，在液体折射率测量方面具有很大的应用潜力。

Optical fibers have been widely applied to telecommunication, imaging, lasers, and sensing. Among the different types of fibers, photonic crystal fibers (PCFs), also called microstructured optical fibers, characterized by air holes arranged along the length of fibers have experienced tremendous advance due to their unique advantages. They are regarded as a desirable platform to excite surface plasmon resonance (SPR) because of easy realization of phase matching conditions between the fundamental core mode and the plasmonic mode, which plays a critical role in miniaturization and integration of SPR sensors. In this mini-review, the current status of PCF sensors based on SPR is summarized. The theory of SPR is discussed, and simulation methods for PCF-SPR sensors are described. The important parameters including the refractive index detection range, resonance wavelength, and spectral sensitivity responsible for the sensing properties of PCF-SPR sensors are reviewed. The fabrication and the comparison of performances are also illustrated, and, finally, the challenges and future perspectives are outlined.