A highly sensitive Photonic Crystal Fiber (PCF) based Surface Plasmon Resonance (SPR) sensor is demonstrated in this paper in the optimized form of circular slotted lattice (CSL) structure. This proposed model performance is numerically scrutinized by using Finite Element Method (FEM) in presence of Perfectly Matched Layer (PML) and Scattering Boundary Condition. Plasmonic material ‘Gold’ which is chemically inert is used in this structure at the outer surface of the slotted area to mitigate fabrication challenge. This model indicates the highest wavelength sensitivity of 16000 nm/RIU using wavelength interrogation, the amplitude sensitivity of 780 RIU⁻¹ by using amplitude interrogation method and the average spectral sensitivity of 6666 nm/RIU, respectively. Besides, this sensor has the potentiality of detecting analytes within Refractive Index (RI) range 1.4 to 1.46 with maximum wavelength resolution of 6.25 × 10⁻⁶ RIU and amplitude resolution of 1.28 × 10⁻⁶ RIU, respectively and the maximum figure of merits of 400 RIU⁻¹. Moreover, the variation of structural parameters (such as pitch, plasmon layer thickness etc.) and the impact of these changes are also discussed in details. According to the high sensitivity performance, polynomial fit and high Figure of Merit (FOM), this amend structure can be a strong competitor in the field of biosensing.

本文以圆形缝隙晶格（CSL）结构的优化形式展示了一种基于高灵敏度光子晶体光纤（PCF）的表面等离子体共振（SPR）传感器。在存在完全匹配层（PML）和散射边界条件的情况下，使用有限元方法（FEM）对提出的模型性能进行了数值检查。具有化学惰性的等离子材料“金”被用于开槽区域外表面的这种结构中，以减轻制造挑战。该模型使用波长询问显示最高波长灵敏度为16000 nm / RIU，振幅灵敏度为780 RIU ^-1分别采用幅度询问法和6666 nm / RIU的平均光谱灵敏度。此外，该传感器具有检测折射率（RI）在1.4至1.46范围内的分析物的潜力，其最大波长分辨率分别为6.25×10 ^-6 RIU和幅度分辨率为1.28×10 ^-6 RIU，最大品质因数为400 RIU ^-1。此外，还详细讨论了结构参数的变化（例如节距，等离激元层厚度等）以及这些变化的影响。根据高灵敏度性能，多项式拟合和高品质因数（FOM），此修改结构可以成为生物传感领域的有力竞争者。