A three-core photonic crystal fiber (PCF) sensor based on surface plasmon resonance (SPR) has been designed with silver film coated on the inner wall of a microfluidic detection channel with three V-grooves. The coupling characteristics and sensing properties of the proposed sensor are analyzed numerically using the full vector finite element method (FEM). The loss spectra and the sensing performance are found to be effectively tuned by the structure parameters of the plasmonic sensor. The simulation results show that an average wavelength sensitivity (WS) of 5413.3 nm/RIU is reached when the refractive index (RI) of the analyte lies in the range from 1.330 to 1.370, while the maximum WS achieves is 11400 nm/RIU, which occurs when the RI varies between 1.365 and 1.370, corresponding to a maximum RI resolution of 8.77 × 10^–6 RIU. This is thus extremely sensitive to changes in analyte RI in the microfluidic channel.

设计了一种基于表面等离子共振 (SPR) 的三芯光子晶体光纤 (PCF) 传感器，在具有三个 V 型槽的微流体检测通道的内壁上涂有银膜。使用全矢量有限元法 (FEM) 对所提出传感器的耦合特性和传感特性进行了数值分析。发现损耗光谱和传感性能可以通过等离子体传感器的结构参数进行有效调整。模拟结果表明，当分析物的折射率（RI）在 1.330 到 1.370 范围内时，平均波长灵敏度（WS）达到 5413.3 nm/RIU，而最大 WS 达到 11400 nm/RIU，即当 RI 在 1.365 和 1.370 之间变化时发生，对应于 8.77 × 10的最大 RI 分辨率^–6 RIU。因此，这对微流体通道中分析物 RI 的变化极为敏感。