Gold nanocones have attracted significant attention extensively for the "lightning rod effect" at the tip. In this study, we systematically investigated the plasmonic characteristics of the gold cone-film composite nanostructure and studied the “lighting rod effect” of the tip. It is discovered that by altering the distribution of the polarized charges, the nanofilm successfully affect the "lightning rod effect" of the tip in dipole resonance (l = 1) and multipole resonance (l = 3). The field enhancement factors of the two resonance modes of the gold nanocone are 23 (l = 1) and 27 (l = 3), respectively. By modifying the gold nanofilm's thickness () and the distance between the gold nanofilm and the gold nanocone (), the field enhancement factors of the two resonance modes can be controlled between 23 and 130 (l = 1) and 16 - 137 (l = 3). This is strongly related to the change in the number of polarized charges. The result expands the application of gold nanocones in enhancement spectroscopy and proposes a new method for tuning the "lightning rod effect" in different resonance modes of the nanoparticles with tips.

中文翻译：

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金锥膜复合纳米结构：高效激发尖端“避雷针效应”的新结构

金纳米锥因其尖端的“避雷针效应”而引起了广泛的关注。在本研究中，我们系统地研究了金锥膜复合纳米结构的等离子体特性，并研究了尖端的“避雷针效应”。研究发现，通过改变极化电荷的分布，纳米膜成功地影响了偶极共振（l = 1）和多极共振（l = 3）中尖端的“避雷针效应”。金纳米锥两种共振模式的场增强因子分别为23（l = 1）和27（l = 3）。通过修改金纳米膜的厚度（）以及金纳米膜与金纳米锥之间的距离（），可以将两种谐振模式的场增强因子控制在23~130（l=1）和16~137（l=1）之间。 3）。这与极化电荷数量的变化密切相关。该结果扩展了金纳米锥在增强光谱中的应用，并提出了一种调节带尖端纳米粒子不同共振模式的“避雷针效应”的新方法。