High Sensitivity Refractive Index Sensor Based on TiO2-Ag Double-Layer Coated Photonic Crystal Fiber

IF 3.3 4区物理与天体物理 Q2 CHEMISTRY, PHYSICAL Plasmonics Pub Date : 2024-08-12 DOI:10.1007/s11468-024-02459-2

Qingyang Liu, Xin Zhao, Qixuan Zhang, Zhiyong Xue, Qiankang Shang, Yao Lu, Weiguo Yan

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Abstract

In this study, a D-type photonic crystal fiber (PCF) refractive index (RI) sensor based on surface plasmon resonance (SPR) is designed. The plasma material is silver (Ag), and the titanium dioxide (TiO₂) is selected to cover the silver film to protect silver from oxidation and enhance the SPR effect. This design enables the sensor to effectively detect the RI change of the analyte. Utilizing the finite element method (FEM), we elaborately researched and optimized various structural parameters and analyzed the influencing factors of the sensor performance. The operating wavelength range of the sensor is from 1000 to 2000 nm. In the RI sensing range of 1.345 to 1.405, the designed PCF sensor possesses an extraordinary maximum wavelength sensitivity of 32,000 nm/RIU, the outstanding figure-of-merit (FOM) of 584.59 RIU⁻¹, and a maximum resolution of 3.125 × 10⁻⁶ RIU. The results concise indicate that the proposed sensor exhibits predominant sensitivity and resolution to the changes of RI of analyte through the SPR effect. The sensor has significant advantages such as ultra-high sensitivity, small size, and low manufacturing complexity.

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基于 TiO2-Ag 双层涂层光子晶体光纤的高灵敏度折射率传感器

本研究设计了一种基于表面等离子体共振（SPR）的 D 型光子晶体光纤（PCF）折射率（RI）传感器。等离子体材料为银（Ag），选择二氧化钛（TiO2）覆盖银膜，以保护银免受氧化并增强 SPR 效果。这种设计使传感器能够有效地检测分析物的 RI 变化。利用有限元法（FEM），我们对各种结构参数进行了精心研究和优化，并分析了传感器性能的影响因素。传感器的工作波长范围为 1000 到 2000 nm。在 1.345 至 1.405 的 RI 传感范围内，所设计的 PCF 传感器的最大波长灵敏度高达 32,000 nm/RIU，优越性能系数（FOM）为 584.59 RIU-1，最大分辨率为 3.125 × 10-6 RIU。这些结果简明扼要地表明，拟议的传感器通过 SPR 效应对分析物的 RI 变化表现出卓越的灵敏度和分辨率。该传感器具有灵敏度超高、体积小、制造复杂度低等显著优势。

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来源期刊

Plasmonics 工程技术-材料科学：综合

CiteScore

5.90

自引率

6.70%

发文量

164

审稿时长

2.1 months

期刊介绍： Plasmonics is an international forum for the publication of peer-reviewed leading-edge original articles that both advance and report our knowledge base and practice of the interactions of free-metal electrons, Plasmons. Topics covered include notable advances in the theory, Physics, and applications of surface plasmons in metals, to the rapidly emerging areas of nanotechnology, biophotonics, sensing, biochemistry and medicine. Topics, including the theory, synthesis and optical properties of noble metal nanostructures, patterned surfaces or materials, continuous or grated surfaces, devices, or wires for their multifarious applications are particularly welcome. Typical applications might include but are not limited to, surface enhanced spectroscopic properties, such as Raman scattering or fluorescence, as well developments in techniques such as surface plasmon resonance and near-field scanning optical microscopy.