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<p>Photonic crystal fibre (PCF) sensors, based on the principle of surface plasmon resonance (SPR), have broad application prospects in many fields such as biomedical sensing, food safety detection and chemical sensing. However, although many PCF-SPR sensors have been proposed, their complex structures, difficult preparation and poor sensing performance have severely limited the further development of this technology. In order to effectively reduce the difficulty of fibre preparation and improve its practicality, this paper designs a high-sensitivity ring-hole array photonic crystal fibre sensor. The sensor is equipped with two layers of ring-hole arrays, the optical fibre is polished into an H-shaped structure, and a gold film is uniformly coated on the polished surface. Simulation analysis shows that this unique structure gives the sensor an ultra-wide detection range and excellent high sensitivity. By optimising the sensor structure, the sensing characteristics have been significantly improved. Specifically, the maximum wavelength sensitivity is up to 34,000&#xa0;nm/RIU, the average sensitivity is 10,833.3&#xa0;nm/RIU, the minimum resolution is as low as 2.94 × 10<sup>−6</sup> RIU<sup>−1</sup>, the detectable refractive index range is 1.36–1.42, and the wavelength detection range is 570 to 1300&#xa0;nm. With the outstanding advantages of simple structure and high sensitivity, this sensor has great potential and value for applications in biomedical sensing, chemical sensing and many other fields.</p>

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Annular Bore Array H-Type PCF-SPR Sensor with High Sensitivity

  • 期刊论文

  • 发表日期：

    2025年7月2日

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  • Fengrui Yang,
  • Wei Liu,
  • Jianxin Wang,
  • Jingwei Lv,
  • Famei Wang,
  • Zao Yi,
  • Qiang Liu,
  • Paul K. Chu,
  • Chao Liu

摘要

Photonic crystal fibre (PCF) sensors, based on the principle of surface plasmon resonance (SPR), have broad application prospects in many fields such as biomedical sensing, food safety detection and chemical sensing. However, although many PCF-SPR sensors have been proposed, their complex structures, difficult preparation and poor sensing performance have severely limited the further development of this technology. In order to effectively reduce the difficulty of fibre preparation and improve its practicality, this paper designs a high-sensitivity ring-hole array photonic crystal fibre sensor. The sensor is equipped with two layers of ring-hole arrays, the optical fibre is polished into an H-shaped structure, and a gold film is uniformly coated on the polished surface. Simulation analysis shows that this unique structure gives the sensor an ultra-wide detection range and excellent high sensitivity. By optimising the sensor structure, the sensing characteristics have been significantly improved. Specifically, the maximum wavelength sensitivity is up to 34,000 nm/RIU, the average sensitivity is 10,833.3 nm/RIU, the minimum resolution is as low as 2.94 × 10−6 RIU−1, the detectable refractive index range is 1.36–1.42, and the wavelength detection range is 570 to 1300 nm. With the outstanding advantages of simple structure and high sensitivity, this sensor has great potential and value for applications in biomedical sensing, chemical sensing and many other fields.