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<p>In this study, a D-shaped photonic crystal fiber (PCF) sensor with surface plasmon resonance (SPR) was designed with Ge-doped Si as the fiber core. The surface plasmon wave was excited by gold plating on the D-shaped surface. Numerical simulations by the finite element method (FEM) show that this sensor can realize a wide detection range of refractive index (RI) measurement from 1.330 to 1.445. The maximum wavelength sensitivity (WS) is 45,600&#xa0;nm/RIU, and the maximum accuracy is 2.19 × 10<sup>−6</sup> RIU. Compared with the sensor with a pure SiO<sub>2</sub> fiber core, the maximum WS is increased by about 2.87 times, and the average WS is increased by 20.6%. The proposed sensor is characterized by a simple structure, high sensitivity, and a large detection range, which has great potential in cell activity monitoring, food additives, and residue detection.</p>

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High Sensitivity SPR Refractive Index Sensor Based on D-shaped PCF with Ge-doped SiO2 Core

  • 期刊论文

  • 发表日期：

    2025年6月12日

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  • Qingcheng You,
  • Yi Zhou,
  • Yukun Zhu,
  • Licui Ji,
  • Yichen Li,
  • Bin Li,
  • Xu Gao,
  • Xing Wang,
  • Honggang Pan

摘要

In this study, a D-shaped photonic crystal fiber (PCF) sensor with surface plasmon resonance (SPR) was designed with Ge-doped Si as the fiber core. The surface plasmon wave was excited by gold plating on the D-shaped surface. Numerical simulations by the finite element method (FEM) show that this sensor can realize a wide detection range of refractive index (RI) measurement from 1.330 to 1.445. The maximum wavelength sensitivity (WS) is 45,600 nm/RIU, and the maximum accuracy is 2.19 × 10−6 RIU. Compared with the sensor with a pure SiO2 fiber core, the maximum WS is increased by about 2.87 times, and the average WS is increased by 20.6%. The proposed sensor is characterized by a simple structure, high sensitivity, and a large detection range, which has great potential in cell activity monitoring, food additives, and residue detection.