近红外光激发表面等离子体共振的光子晶体光纤高折射率传感器

Photonic crystal fiber high refractive index sensor with surface plasmon resonance excited by near-infrared light

摘要:

本文设计了一种基于表面等离子体共振(surface plasmon resonance,SPR)效应的光子晶体光纤(photonic crystal fiber,PCF)折射率传感器,通过创新性地在近红外波段(1.3—2.3 μm)激发SPR效应,显著提升了同类型传感器在该波段的折射率检测上限,实现了高折射率物质的精确传感。采用有限元方法(finite element method,FEM)对传感器结构进行了系统仿真与优化,重点分析了其光学损耗特性、SPR效应表现及折射率传感性能。实验结果表明,该传感器在1.44—1.58的宽折射率范围内表现出优异的传感特性,其灵敏度高达9 100 nm/RIU,分辨率达到1.099×10-5 RIU。这种高性能SPR-PCF传感器在环境监测领域,特别是原油泄漏检测方面展现出重要的应用前景,为复杂环境下高精度折射率检测提供了新的技术方案。

Abstract:

This study presents a high-performance refractive index sensor based on surface plasmon resonance (SPR) in a photonic crystal fiber (PCF).By exciting SPR in the near- infrared band (1.3—2.3 μm), the proposed sensor extends the refractive index detection upper limit for similar SPR-PCF sensors while enabling high-refractive-index sensing.The sensor′s optical loss,SPR characteristics and refractive index sensitivity are systematically investigated using the finite element method (FEM), and its structure is optimized for enhanced performance. Within the refractive index range of 1.44—1.58,the sensor achieves a remarkable sensitivity of 9 100 nm/RIU and a resolution of 1.099×10-5 RIU.These advancements make the sensor highly promising for applications in environmental monitoring,particularly in crude oil leakage detection.