在尖端增强拉曼光谱中成像金尖端和金纳米棒晶格形成的纳米腔的空间等离子体模式

Zhe He, Jue Wang, Rui Wang, Dmitry Kurouski
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摘要

在尖端增强拉曼光谱(TERS)中集成金纳米棒可显著提高增强因子,这主要是由于间隙模式效应。通过平行排列金纳米棒,我们构建了一个金纳米棒晶格(称为金纳米晶格),由于金纳米棒之间的表面等离子体共振,它进一步放大了 TERS 成像的优势。这项研究的一个重要方面是调查 TERS 测量过程中纳米晶格内的热点分布。此外,我们还证明了尖端晶格纳米腔体是决定这些热点的强度和空间分布的主要因素。利用实验和模拟结果,我们说明了尖端晶格空腔的增强效应,并阐明了热点强度与空腔尺寸之间的联系。这种综合方法有助于我们理解纳米晶格在 TERS 中的作用,并为优化纳米光子应用提供了宝贵的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Imaging spatial plasmon mode of nanocavity formed by Au tip and Au nanorod lattice in tip-enhanced Raman spectroscopy
The integration of Au nanorods in tip-enhanced Raman spectroscopy (TERS) presents a significant increase in the enhancement factor, primarily due to the gap-mode effect. By aligning Au nanorods in parallel, we construct an Au nanorod lattice, referred to as the Au nanolattice, which further amplifies the advantages of TERS imaging due to the induced inter-nanorod surface plasmon resonance. A critical aspect in this research involves investigating the distribution of hotspots within the nanolattice during TERS measurements. Additionally, we demonstrate that the tip–lattice nanocavity is a predominant factor in determining both the intensity and spatial distribution of these hotspots. Employing the experimental and simulation results, we illustrate the enhancement effect of the tip–lattice cavity and elucidate the connection between the hotspot intensity and cavity size. This comprehensive approach contributes to our understanding of the nano-lattice’s role in TERS and offers valuable insights for optimizing nanophotonic applications.
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