Photon emission at step edges of single crystalline gold surfaces investigated by scanning tunnelling microscopy

被引：4

作者：

Boyle, MG ^{[1
]}

Mitra, J ^{[1
]}

Dawson, P ^{[1
]}

机构：

[1] Queens Univ Belfast, Int Ctr Expt Phys, Nanostruct Media Res Grp, Belfast BT7 1NN, Antrim, North Ireland

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS | 2006年 / 45卷 / 3B期

基金：

英国工程与自然科学研究理事会;

关键词：

scanning tunneling microscopy; photon emission; surface plasmon;

D O I：

10.1143/JJAP.45.2119

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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 photollic 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.

引用

页码：2119 / 2123

页数：5

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