Scholarlink

<p>In this paper, we propose a novel surface plasmon resonance (SPR) refractive index sensor exhibiting high sensitivity, accompanied by the derivation of an analytical mathematical model for predicting its sensitivity response. A novel D-shaped photonic crystal fiber (PCF) featuring two concentric layers of pentagonal air holes around the core was designed, and the effects of deviations in the structural parameters on the sensing performance were analyzed using the finite element method (FEM). When gold was used as the plasmonic coating, numerical simulations indicated a maximum wavelength sensitivity of 27,800 nm/RIU in the refractive index range of 1.30-1.40. An analytical mathematical model of the SPR sensitivity of microstructured optical fibers was developed for the first time to explain the mechanism underlying this high sensor sensitivity. Based on this model, the silica core was replaced with CYTOP polymer, shifting the phase-matching point to a region where the slope difference between the core mode and the surface plasmon polariton (SPP) mode intersection is minimal. FEM simulations of the CYTOP-core design confirmed the model’s predictions, yielding a maximum sensitivity of 19,000 nm/RIU in the refractive index range of 1.230-1.301. These results validate the proposed model and demonstrate that the sensor offers excellent performance for biomedical and environmental refractive index sensing.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Highly Sensitive D-Shaped Photonic Crystal Fiber SPR Sensor with Double-Layer Pentagonal Structure: Design and Mechanism Analysis

  • 期刊论文

  • 发表日期：

    2025年11月18日

查看全文
  • Chen-Xi Gao,
  • Qing-Shun Qu,
  • Wan-Ming Zhao,
  • Junsheng Wang,
  • Yuezhu Wang

摘要

In this paper, we propose a novel surface plasmon resonance (SPR) refractive index sensor exhibiting high sensitivity, accompanied by the derivation of an analytical mathematical model for predicting its sensitivity response. A novel D-shaped photonic crystal fiber (PCF) featuring two concentric layers of pentagonal air holes around the core was designed, and the effects of deviations in the structural parameters on the sensing performance were analyzed using the finite element method (FEM). When gold was used as the plasmonic coating, numerical simulations indicated a maximum wavelength sensitivity of 27,800 nm/RIU in the refractive index range of 1.30-1.40. An analytical mathematical model of the SPR sensitivity of microstructured optical fibers was developed for the first time to explain the mechanism underlying this high sensor sensitivity. Based on this model, the silica core was replaced with CYTOP polymer, shifting the phase-matching point to a region where the slope difference between the core mode and the surface plasmon polariton (SPP) mode intersection is minimal. FEM simulations of the CYTOP-core design confirmed the model’s predictions, yielding a maximum sensitivity of 19,000 nm/RIU in the refractive index range of 1.230-1.301. These results validate the proposed model and demonstrate that the sensor offers excellent performance for biomedical and environmental refractive index sensing.