In this paper, we present a detailed study on surface plasmon resonance (SPR)-based D-shaped single-mode optical fiber sensor for the range of refractive index (RI) 1.33–1.42 sensing using the finite element method (FEM). Gold (Au), silver (Ag), and copper (Cu) metal layers have used separately to investigate the performance of proposed sensor employed with SPR conditions. Average and maximum sensitivity of the sensor increases with the thicknesses of the metal layer. We observe the higher sensitivity for the Au layer in comparison to Ag and Cu layers. Sensor with Au layer with 50 nm thickness shows the average sensitivity of 5855 nm/RIU with maximum sensitivity of 15,200 nm/RIU and resolution 1.780 × 10⁻⁵ RIU. The figure of merit (FOM) has also investigated for such sensor. The sensing performance of the sensor sequentially decreases with Ag and Cu layers. The proposed optical fiber sensors with high sensing performance can be utilized as RI sensors for different chemical and biological sensing.

在本文中，我们对基于表面等离子共振（SPR）的D形单模光纤传感器进行了详细研究，以使用有限元方法（FEM）进行折射率（RI）1.33–1.42感测。金（Au），银（Ag）和铜（Cu）金属层已分别用于研究建议的传感器在SPR条件下使用的性能。传感器的平均灵敏度和最大灵敏度随金属层的厚度而增加。我们观察到与Ag和Cu层相比，Au层的灵敏度更高。具有厚度为50 nm的Au层的传感器显示平均灵敏度为5855 nm / RIU，最大灵敏度为15,200 nm / RIU，分辨率为1.780×10 ^-5RIU。品质因数（FOM）也已针对此类传感器进行了研究。传感器的感测性能随Ag和Cu层的增加而依次降低。所提出的具有高感测性能的光纤传感器可以用作用于不同化学和生物感测的RI传感器。