基于ITO的高灵敏度折射率D型光子晶体光纤等离子体传感器
High-Sensitivity SPR Refractive Index Sensor Based on ITO-Coated D-Shaped Photonic Crystal Fiber
DOI: 10.12677/jsta.2026.143039, PDF,   
作者: 张其轩, 赵 欣：天津工业大学物理科学与技术学院，天津
关键词: 光子晶体光纤；等离子体共振；波长灵敏度；Photonic Crystal Fiber； Plasmon Resonance； Wavelength Sensitivity
摘要: 本文针对传统表面等离子体共振(SPR)传感器存在的灵敏度低的问题，基于光子晶体光纤(PCF)设计了一种具有增敏结构的SPR传感器。我们通过在抛光后的D型PCF表面沉积氧化铟锡(ITO)薄膜，引发SPR效应以增强模式耦合强度，从而显著提升传感性能，而且结构设计中采用数量较少的空气孔结构，既简化了制造工艺，又增强了光能在纤芯中的聚束效果。采用有限元法(FEM)数值分析对光纤结构参数进行优化，仿真结果表明，传感器折射率(RI)的范围从1.26到1.33，所设计的传感器表现出为25,000 RIU卓越的最大波长灵敏度，226.25 RIU−1出色的品质因数(FOM)和4.0 × 10−6 RIU的分辨率。所提出的传感器在工业分析，生物化学分析和医疗诊断都有潜在的应用前景，可为D型光子晶体光纤传感器的设计优化、材料选型与实际应用提供系统的理论依据与设计参考。
Abstract: Aiming at the problem of low sensitivity in traditional surface plasmon resonance (SPR) sensors, an SPR sensor with a sensitivity-enhanced structure is designed based on photonic crystal fiber (PCF) in this paper. Indium tin oxide (ITO) thin film is deposited on the surface of the polished D-shaped PCF to excite the SPR effect and enhance the mode coupling strength, thereby significantly improving the sensing performance. In addition, a small number of air holes are adopted in the structural design, which not only simplifies the manufacturing process but also enhances the light confinement effect in the fiber core. The numerical analysis and optimization of the fiber structural parameters are carried out using the finite element method (FEM). The simulation results show that in the refractive index (RI) range of 1.26 to 1.33, the proposed sensor exhibits an excellent maxi-mum wavelength sensitivity of 25,000 nm/RIU, a remarkable figure of merit (FOM) of 226.25 RIU−1, and a resolution of 4.0 × 10−6 RIU. The proposed sensor has promising application prospects in industrial analysis, biochemical analysis, and medical diagnosis, which can provide a systematic theoretical basis and design reference for the structural optimization, material selection, and practical application of D-shaped PCF sensors.
文章引用：张其轩, 赵欣. 基于ITO的高灵敏度折射率D型光子晶体光纤等离子体传感器[J]. 传感器技术与应用, 2026, 14(3): 390-399. https://doi.org/10.12677/jsta.2026.143039

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