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<p>In this paper, a trench D-shape photonic crystal fiber (PCF) refractive index (RI) sensor based on surface plasmon resonance (SPR) effect is proposed. By finite element method, the mode coupling characteristics and the RI sensing characteristics of the X-polarization and Y-polarization (Y-pol) core modes are analyzed, and the influence laws of the structure parameters change on confinement loss, resonance wavelength, and wavelength sensitivity (<i>WS</i>) of the Y-pol core mode are summarized. The final simulation results show that in the RI range of 1.32 ~ 1.38, the average <i>WS</i> of the Y-pol core mode can reach 5500&#xa0;nm/RIU and the maximum <i>WS</i>, highest resolution (<i>R</i>), and maximum amplitude sensitivity (<i>AS</i>) of the Y-pol core mode are 11,500&#xa0;nm/RIU, 1.74 × 10<sup>−6</sup> RIU, and 133.4 RIU<sup>−1</sup>, respectively. Compared with other reported results, the proposed trench D-shape PCF-SPR RI sensor has simple fabrication process, feasible experimental system, and more comprehensive RI sensing performances such as wider RI detection range, larger average <i>WS</i>, higher <i>R</i>, and larger maximum <i>WS</i> and <i>AS</i>. Therefore, it is expected to play an important application value in the fields such as biomedical, environmental testing, and food monitoring fields.</p>

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A Trench D-Shaped Photonic Crystal Fiber Refractive Index Sensor Based on Surface Plasmon Resonance

  • 期刊论文

  • 发表日期：

    2025年9月2日

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  • Yuwei Qu,
  • Chunlan Zhang,
  • Dong Li,
  • Xiaolan Liu,
  • Jinhui Yuan,
  • Binbin Yan,
  • Kuiru Wang,
  • Xinzhu Sang,
  • Chongxiu Yu

摘要

In this paper, a trench D-shape photonic crystal fiber (PCF) refractive index (RI) sensor based on surface plasmon resonance (SPR) effect is proposed. By finite element method, the mode coupling characteristics and the RI sensing characteristics of the X-polarization and Y-polarization (Y-pol) core modes are analyzed, and the influence laws of the structure parameters change on confinement loss, resonance wavelength, and wavelength sensitivity (WS) of the Y-pol core mode are summarized. The final simulation results show that in the RI range of 1.32 ~ 1.38, the average WS of the Y-pol core mode can reach 5500 nm/RIU and the maximum WS, highest resolution (R), and maximum amplitude sensitivity (AS) of the Y-pol core mode are 11,500 nm/RIU, 1.74 × 10−6 RIU, and 133.4 RIU−1, respectively. Compared with other reported results, the proposed trench D-shape PCF-SPR RI sensor has simple fabrication process, feasible experimental system, and more comprehensive RI sensing performances such as wider RI detection range, larger average WS, higher R, and larger maximum WS and AS. Therefore, it is expected to play an important application value in the fields such as biomedical, environmental testing, and food monitoring fields.