In this paper, a proper concept of a kind of photonic crystal fiber known as D-shaped PCF sensor based on SPR or Surface Plasmon Resonance phenomenon has been discussed. The analysis has been performed numerically using FEM or Finite Element Method and PML (Perfectly Matched Layer) boundary conditions. Modal analysis has been performed keeping the smallest mesh as possible. The main mechanism of the sensor is the interaction between the core guided light beam and the metal layer surface that generates free electrons. The proposed sensor shows a refractive index detection range of 1.42–1.46 RIU, with a metal thickness variation of 35 nm-45 nm and a pitch variation of 1.8 μm–2.0 μm. The sensor obtained the highest sensitivity of 15000 nm/RIU with a maximum 6.67 × ${10}^{-6}$ RIU resolution, using the wavelength interrogation method. Average spectral sensitivity is 8000 nm/RIU. The amplitude interrogation method found a maximum sensitivity of 230 RIU⁻¹ with a resolution of 4.348 × ${10}^{-5}$ RIU. The sensor also shows high linearity fitting and Figure of Merit (FoM). For ease of design, high detection range, high wavelength and amplitude sensitivity, less fabrication complexity, high linearity and stability, the sensor can be a great competitor of the PCF sensors previously proposed.

在本文中，讨论了一种基于SPR或表面等离子体共振现象的称为D形PCF传感器的光子晶体光纤的正确概念。已经使用FEM或有限元方法和PML（完全匹配层）边界条件进行了数值分析。进行了模态分析，以保持最小的网格。传感器的主要机理是纤芯导向光束与产生自由电子的金属层表面之间的相互作用。提出的传感器显示的折射率检测范围为1.42-1.46 RIU，金属厚度变化在35 nm-45 nm之间，间距变化在1.8μm-2.0μm之间。该传感器获得了最高灵敏度15000 nm / RIU和最大6.67× ${10}^{--6}$RIU分辨率，使用波长询问方法。平均光谱灵敏度为8000 nm / RIU。幅度询问法发现最大灵敏度为230 RIU ^-1，分辨率为4.348× ${10}^{--5}$RIU。该传感器还显示出高线性拟合和品质因数（FoM）。为了简化设计，提高检测范围，提高波长和幅度灵敏度，降低制造复杂性，提高线性度和稳定性，该传感器可以成为先前提出的PCF传感器的强大竞争对手。