Photon Emission at Step Edges of Single Crystalline Gold Surfaces Investigated by Scanning Tunnelling Microscopy

概要

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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.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2006-03-15