STM-induced photon emission spectroscopy of granular gold surfaces in air

被引：23

作者：

Bischoff, MMJ ^{[1
]}

van der Wielen, MCMM ^{[1
]}

van Kempen, H ^{[1
]}

机构：

[1] Catholic Univ Nijmegen, Inst Mat Res, NL-6525 ED Nijmegen, Netherlands

来源：

SURFACE SCIENCE | 1998年 / 400卷 / 1-3期

关键词：

gold; luminescence; photon emission; polycrystalline surfaces; scanning tunneling microscopy;

D O I：

10.1016/S0039-6028(97)00855-8

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Light emission has been detected under ambient conditions in the tip-sample region of a scanning tunneling microscope (STM) consisting of an etched gold tip and a granular gold film. The photon yield as a Function of surface geometry (photon mapping) has been studied. BS' means of STM, it was possible to measure photon emission spectra locally. We have studied the effect of grain size and applied bias voltage on the spectrum. We found that the peak position in the photon emission spectrum shifts to a shorter wavelength when increasing the bias voltage and shifts to a longer wavelength when tunneling to larger grains. These effects can be understood in a simple model which considers tunneling electrons exciting localized surface plasmons which decay bq emitting photons. (C) 1998 Elsevier Science B.V.

引用

页码：127 / 133

页数：7

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