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<p>A polarization-insensitive highly sensitive photonic crystal fiber (PCF) based surface plasmon resonance (SPR) sensor for sucrose concentration detection in the visible to the near-infrared region is presented and analyzed by the finite element method (FEM). A combination of bimetallic plasmonic material such as gold with tantalum pentoxide (Au-Ta<sub>2</sub>O<sub>5</sub>) layers has been used to initiate higher SPR excitation to enhance the fiber sensing performance. To ensure the feasibility of the operation, the sensor is designed so that the target analytes and plasmonic materials are strategically positioned on the periphery. By optimizing its structural parameters, the sensor has attained a maximum wavelength sensitivity (WS) of 67,619.04&#xa0;nm/RIU, amplitude sensitivity (AS) of 3838.07 RIU<sup>−1</sup>, sensor resolution (SR) of 1.47 × 10<sup>−6</sup> RIU, and a figure of merit (FOM) of 2366.67 RIU<sup>−1</sup> for both x and y-polarization to detect sucrose concentration 0 to 50%. Moreover, the sensor's sensitivity is not significantly affected by the variations in the dimensions of the intended air holes, resulting in a sensor that exhibits a high degree of structural tolerance.</p>

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Polarization-Insensitive Photonic Crystal Fiber Based Plasmonic Sensor for Sucrose Detection with High Sensitivity

  • 期刊论文

  • 发表日期：

    2025年9月5日

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  • Hasan Masud Khan,
  • M. Shah Alam

摘要

A polarization-insensitive highly sensitive photonic crystal fiber (PCF) based surface plasmon resonance (SPR) sensor for sucrose concentration detection in the visible to the near-infrared region is presented and analyzed by the finite element method (FEM). A combination of bimetallic plasmonic material such as gold with tantalum pentoxide (Au-Ta2O5) layers has been used to initiate higher SPR excitation to enhance the fiber sensing performance. To ensure the feasibility of the operation, the sensor is designed so that the target analytes and plasmonic materials are strategically positioned on the periphery. By optimizing its structural parameters, the sensor has attained a maximum wavelength sensitivity (WS) of 67,619.04 nm/RIU, amplitude sensitivity (AS) of 3838.07 RIU−1, sensor resolution (SR) of 1.47 × 10−6 RIU, and a figure of merit (FOM) of 2366.67 RIU−1 for both x and y-polarization to detect sucrose concentration 0 to 50%. Moreover, the sensor's sensitivity is not significantly affected by the variations in the dimensions of the intended air holes, resulting in a sensor that exhibits a high degree of structural tolerance.