Photon Emission at Step Edges of Single Crystalline Gold Surfaces Investigated by Scanning Tunnelling Microscopy
Photon Emission at Step Edges of Single Crystalline Gold Surfaces Investigated by Scanning Tunnelling Microscopy
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DOI：
10.1143/jjap.45.2119
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发表时间：
2006-03
影响因子：
1.5
通讯作者：
M. Boyle;J. Mitra;P. Dawson
中科院分区：
文献类型：
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作者：
M. Boyle;J. Mitra;P. Dawson
在扫描隧道显微镜中，Au针尖扫描具有多个缺陷的Au(111)表面产生的光发射与形貌同时被映射。地形图和光子图中的特征之间非常好的一致性掩盖了不同类型特征的地形和光子信号轮廓之间的相关性细节上的显著差异。根据针尖样品纳米腔几何结构的变化对局域表面等离子体波的支撑和散射的影响，定性地解释了光子信号随表面形貌的变化。特别是，来自光学光谱学的证据表明，当尖锐的台阶边缘轮廓尖端时，存在更高能量的模式；该模式不存在于同一样品的平面小平面区域。
Light emission in scanning tunnelling microscopy arising from Au tips scanning Au(111) surfaces with multiple defects is mapped simultaneously with topography. The remarkably good correspondence between features in the topography and the photon maps masks marked differences in the details of the correlation between the topographic and photonic signal profiles across different types of features. The variation of photon signal with topography is qualitatively explained in terms of the influence of changes in the geometry of the tip–sample nanocavity on the support and scattering of localised surface plasmon modes that are responsible for the light emission. In particular, evidence from optical spectroscopy shows the existence of a higher energy mode when a sharp step edge profiles the tip; this mode is not present in planar facet areas of the same sample.