Ag涂层内凹弧形针尖增强喇曼散射效应仿真研究

发布时间：2018-06-15 05:28

本文选题：针尖增强喇曼散射 + 增强因子　；参考：《光子学报》2017年10期

【摘要】：设计了一种表面镀有Ag涂层且具有内凹弧度的圆锥形钨(W)针尖,运用时域有限差分法建立了针尖-球形样品结构的针尖增强喇曼散射模型,研究了针尖增强效应及参数优化配置.采用波长632.8nm光源斜入射激励方式,对模型的针尖增强喇曼散射效应进行电磁场仿真计算,获得了模型在不同光源入射角度、样品粒径、针尖-样品间距下的增强电场强度和针尖增强喇曼散射增强因子.研究结果表明:当光源入射角为72°、样品粒径约为140nm、针尖-样品间距达到2nm时可产生最大的增强因子,达到104量级.该结果为制备高增强效率的探针针尖,及其在高空间分辨率和高检测灵敏度喇曼光谱仪中的实用化提供了参考依据.
[Abstract]:A tapered tungsten W) tip coated with Ag coating and with internal concave radians is designed. A needle-tip enhanced Raman scattering model for the tip spherical sample structure is established by using the finite-difference time-domain method (FDTD). The tip enhancement effect and parameter optimization are studied. With the oblique incident excitation of wavelength 632.8nm light source, the electromagnetic field simulation of the needle-tip enhanced Raman scattering effect of the model was carried out, and the particle size of the model was obtained at different incident angles of the light source. The enhancement of electric field intensity and the enhancement factor of Raman scattering at the tip to sample spacing. The results show that when the incident angle of the light source is 72 掳, the particle size is about 140 nm, and the pitch between the tip and the sample reaches 2nm, the maximum enhancement factor can be produced, reaching 104 orders of magnitude. The results provide a reference for the preparation of high enhancement efficiency probe tip and its application in high spatial resolution and high detection sensitivity Raman spectrometer.
【作者单位】：中国计量大学计量测试工程学院;中国计量科学研究院;
【基金】：国家重点研发计划专项(No.2016YFF0200602) 国家自然科学基金(No.51504229)资助~~
【分类号】：O657.37

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