A novel dual side-polished photonic crystal fiber (DSP-PCF) refractive index (RI) sensor is proposed for the RI detection range of 1.30−1.35. An active plasmonic metal gold (Au) is deposited on a polished flat fiber surface to generate plasmons so that it can detect the change in RIs of its surrounding medium. A thin titanium dioxide (TiO₂) layer is coated to assist the adhesion of Au layer with silica-based fiber. To enhance the sensitivity, silicon nitride (Si₃N₄) is deposited on the top of Au to make it as a dielectric sensing layer. Simulation outcomes demonstrate that the maximum wavelength sensitivity (WS), amplitude sensitivity (AS) and RI resolution reach the highest value of 35,000 nmRIU⁻¹, 350 RIU⁻¹ and $4.347\times {10}^{-6}\text{R}\text{I}\text{U}$, respectively, for DSP-PCF. Additionally, the obtained WS for DSP-PCF is far better than the recently reported PCF sensors in the above mentioned RI detection range to the best of our knowledge. With these significant outcomes over the wide analyte RI range, the proposed sensor opens new possible study windows in the field of organic chemicals and biological sensing.

提出了一种新颖的双面抛光光子晶体光纤（DSP-PCF）折射率（RI）传感器，用于RI的检测范围为1.30-1.35。活性等离激元金属金（Au）沉积在抛光的扁平纤维表面上以产生等离激元，因此它可以检测其周围介质的RIs变化。涂覆一层薄的二氧化钛（TiO ₂）层，以帮助Au层与二氧化硅基纤维粘合。为了提高灵敏度，氮化硅（Si ₃ N ₄）沉积在Au的顶部，使其成为介电传感层。仿真结果表明，最大波长灵敏度（WS），振幅灵敏度（AS）和RI分辨率达到35000 nmRIU的最高值^-1，350 RIU ^-1 和 $4.347\times {10}^{--6}\text{[R}\text{一世}\text{ü}$分别用于DSP-PCF。此外，据我们所知，在上述RI检测范围内，所获得的用于DSP-PCF的WS远远优于最近报道的PCF传感器。由于在广泛的分析物RI范围内具有这些显着成果，因此所提出的传感器为有机化学和生物传感领域打开了新的可能的研究窗口。