In this article, a highly sensitive surface plasmon resonance (SPR) based concave shaped refractive index sensor (CSRIS) is designed and analyzed using silver (Ag) nanowire. The SPR effect between the surface plasmon polariton (SPP) and core guided modes of the concave shape (CS) designed sensor is used to measure the variation in refractive index (RI) of analytes ( na\text{n}_{\mathbf {a}} ). The sensing performance and the coupling properties of proposed sensor are numerically analyzed using finite element method (FEM) based on COMSOL Multiphysics. Results exhibit a high wavelength and amplitude sensitivity of 9314.28 nm/RIU and 1494 RIU−1, respectively for the RI varying between 1.33 to 1.38 with the resolution of 1.073×10−51.073\times 10\,\,^{ {-5}} RIU. The designed sensor is easy to fabricate as it requires the Ag nanowire to be deposited on the concave shaped microfluidic channel (CSMFC) which is later covered with measurand. various structural parameters, i.e. distance of channel from core, diameter of Ag nanowire, and channel size, are also optimized for better sensing response.

中文翻译：

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基于 SPR 的光纤折射率传感器使用银纳米线辅助 CSMFC


在本文中，使用银（Ag）纳米线设计并分析了基于高灵敏度表面等离子共振（SPR）的凹形折射率传感器（CSRIS）。凹面形状 (CS) 设计的传感器的表面等离子体激元 (SPP) 和芯导模之间的 SPR 效应用于测量分析物折射率 (RI) 的变化 ( na\text{n}_{\mathbf {一个}}）。使用基于 COMSOL Multiphysics 的有限元法 (FEM) 对所提出的传感器的传感性能和耦合特性进行了数值分析。结果显示，对于 RI 在 1.33 至 1.38 之间变化的波长和振幅灵敏度分别为 9314.28 nm/RIU 和 1494 RIU−1，分辨率为 1.073×10−51.073\times 10\,\,^{ {-5} } RIU。设计的传感器易于制造，因为它需要将银纳米线沉积在凹形微流体通道（CSMFC）上，然后用被测量覆盖。各种结构参数，即通道距核心的距离、银纳米线的直径和通道尺寸也经过优化，以获得更好的传感响应。