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<p>A D-type photonic crystal fiber (PCF) sensor based on surface plasmon resonance (SPR) principle is designed. In order to excite the SPR effect, a gold film is plated on the open-loop channel of the sensor, the free electrons in a metal are resonated with photons. The structural parameters are fine-tuned and the sensing performance of the sensor is studied. The results show that the maximum spectral sensitivity reaches 18 000 nm/RIU in the refractive index range of 1.24–1.32, and the maximum resolution is 5.56×10<sup>−6</sup> RIU. The novel structure with high sensitivity and low refractive index provides a new perspective for fluid density detection.</p>

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High sensitivity and low refractive index D-type photonic crystal fiber sensor based on surface plasmon resonance

  • 期刊论文

  • 发表日期：

    2025年8月27日

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  • Jiachen Gao,
  • Xianbing Ming,
  • Xiang Wen

摘要

A D-type photonic crystal fiber (PCF) sensor based on surface plasmon resonance (SPR) principle is designed. In order to excite the SPR effect, a gold film is plated on the open-loop channel of the sensor, the free electrons in a metal are resonated with photons. The structural parameters are fine-tuned and the sensing performance of the sensor is studied. The results show that the maximum spectral sensitivity reaches 18 000 nm/RIU in the refractive index range of 1.24–1.32, and the maximum resolution is 5.56×10−6 RIU. The novel structure with high sensitivity and low refractive index provides a new perspective for fluid density detection.