A simple configuration of a photonic crystal fiber (PCF) with dual-core is proposed that utilizes surface plasmon resonance (SPR) to work as a refractive index (RI) sensor. The PCF structure is asymmetric; thus, the PCF shows birefringence. A plasmonic metal layer of gold is placed over the fiber sensor to form an analyte channel externally. The sensing range and sensitivity are extended by investigating the best field path that moves from the core throughout the cladding towards the plasmonic layer. The best field path increases the analyte sensing range from 1.33 to 1.43, where the analyte flows through the external channel. The light-guiding properties of the sensor are explored by the finite element method. The optical properties of the sensor are numerically analyzed by the wavelength and amplitude integration methods. The numerical analysis found that the maximum wavelength sensitivity is 44,000 nm/RIU and 50,000 nm/RIU for x- and y-polarization, respectively. Additionally, the maximum amplitude sensitivity for x- and y- polarization is 2244 RIU^-1 and 1605 RIU^-1, respectively. The highest figure of merit (FOM) of the sensor is 721 and 769 for the x- and y- polarization, respectively. We also investigate the fabrication tolerance of the PCF detector. The sensor can be used for unknown biological or biochemical samples finding because of its wide sensing range with high sensitivity.

提出了一种简单的双芯光子晶体光纤 (PCF) 配置，它利用表面等离子体共振 (SPR) 作为折射率 (RI) 传感器。PCF结构不对称；因此，PCF 显示双折射。等离子金属金层放置在光纤传感器上，以在外部形成分析物通道。通过研究从核心穿过包层向等离子体层移动的最佳场路径，扩展了传感范围和灵敏度。最佳场路径将分析物检测范围从 1.33 增加到 1.43，其中分析物流经外部通道。通过有限元方法探索传感器的光导特性。通过波长和幅度积分方法对传感器的光学特性进行数值分析。x和y极化，分别。此外，x和y极化的最大振幅灵敏度分别为2244 RIU ^{- 1}和 1605 RIU ^{- 1}。对于x和y偏振，传感器的最高品质因数 (FOM) 分别为 721 和 769 。我们还研究了 PCF 探测器的制造公差。该传感器传感范围广，灵敏度高，可用于未知生物或生化样品的寻找。