In this work, a simple gold-glazed dual-core photonic crystal fiber (PCF) is inspected by using surface plasmon resonance for biochemical sensing. Based on high sensing performance and chemical substantiality, gold (Au) is selected as plasmonic material to coat the external surface of the design. The target analyte and gold layer are placed on the outer surface of the PCF to offer fabrication simplicity. A central elliptical air hole is embellished to increase structural asymmetry between both cores hence the sensor came out with improved sensing performances. The numerical analysis of the proposed design is investigated employing the finite element method (FEM). The maximum optimized value of wavelength sensitivity is recorded at about 8000 nm/RIU with a resolution of 12.5×10⁻⁶ and amplitude sensitivity is achieved 1443 RIU⁻¹ for the refractive index of 1.39. Furthermore, a detailed study is also performed to investigate the effects of varying sensor's geometrical parameters such as the thickness of gold and analyte layer, pitch distance, diameters of cladding air holes, geometrical shapes of air hole at core. According to these results along with simple structural design, the proposed model can be practical enough for biochemical and bio-molecular substance detection.

在这项工作中，通过使用表面等离子体共振进行生化传感来检查简单的镀金双芯光子晶体光纤 (PCF)。基于高传感性能和化学实质，选择金 (Au) 作为等离子体材料来涂覆设计的外表面。目标分析物和金层放置在 PCF 的外表面上，以简化制造。中央椭圆形气孔被装饰以增加两个核心之间的结构不对称性，因此传感器具有改进的传感性能。采用有限元方法 (FEM) 对拟议设计的数值分析进行了研究。波长灵敏度的最大优化值记录在约 8000 nm/RIU，分辨率为 12.5×10 ^-6对于 1.39 的折射率，振幅灵敏度达到 1443 RIU ^-1。此外，还进行了详细的研究，以研究不同传感器几何参数的影响，例如金和分析物层的厚度、间距、包层气孔直径、核心气孔几何形状。根据这些结果以及简单的结构设计，所提出的模型对于生化和生物分子物质的检测具有足够的实用性。