Effect of electromagnetic interactions on plasmon excitations in silver particle ensembles

被引：6

作者：

Benia, H. -M. ^{[1
]}

Nilius, N. ^{[1
]}

Freund, H. -J. ^{[1
]}

机构：

[1] Max Planck Gesell, Fritz Haber Inst, D-14195 Berlin, Germany

来源：

SURFACE SCIENCE | 2006年 / 600卷 / 10期

关键词：

silver particles; photon emission spectroscopy; scanning tunneling microscopy;

D O I：

10.1016/j.susc.2006.03.010

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：

The optical properties of silver nano-particle ensembles are studied as a function of particle density by analyzing the light emission excited via electron injection from an STM tip. The particles are prepared with distinct dome and disk-like shapes on a Al2O3/NiAl(110) support. The particle density is varied over one order of magnitude by changing the Ag deposition temperature and the defect concentration in the oxide surface. With increasing density, a pronounced blue shift of the Ag plasmon mode is observed for ensembles of domelike particles, whereas disk-like particles show relatively constant resonance energies. The observed evolution of plasmon energy as a function of particle density reflects the influence of electromagnetic interactions in the ensemble, as verified by model calculations. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：L128 / L133

页数：6

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