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Optical Properties of Metal Tips for Tip-Enhanced Spectroscopiest

机译:用于尖端增强光谱学的金属尖端的光学特性

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摘要

We develop a full 3D approach to simulate the optical properties of sharp metal tips that could be quantitatively compared with experiments and provide accurate predictions. Similar to metallic wires, elongated metal tips support a series of extended mode resonances whose properties are largely determined by the tip geometry and are essentially independent of the tip material. For sufficiently long tips, these resonances are energetically well separated from a broader, high-energy feature, whose position and line shape are independent of the tip length but vary strongly with the tip material. The latter is a localized plasmon mode characterized by the hemisphere terminating the tip.
机译:我们开发了一种完整的3D方法来模拟尖锐金属尖端的光学特性,可以将其与实验进行定量比较并提供准确的预测。与金属线相似,细长的金属尖端支持一系列扩展模式共振,其特性在很大程度上取决于尖端的几何形状,并且基本上与尖端的材料无关。对于足够长的笔尖,这些共振与较宽的高能量特征在能量上充分分开,后者的位置和线形与笔尖长度无关,但随笔尖材料而变化很大。后者是局部等离激元模式,其特征在于半球终止尖端。

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