Optically controlled interparticle distance tuning and welding of single gold nanoparticle pairs by photochemical metal deposition

被引：40

作者：

Haertling, T. ^{[1
]}

Alaverdyan, Y. ^{[2
,3
]}

Hille, A. ^{[1
]}

Wenzel, M. T. ^{[1
]}

Kall, M. ^{[2
]}

Eng, L. M. ^{[1
]}

机构：

[1] Tech Univ Dresden, Inst Angew Photophys, D-01062 Dresden, Germany

[2] Chalmers, Dept Appl Phys, SE-41296 Gothenburg, Sweden

[3] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

来源：

OPTICS EXPRESS | 2008年 / 16卷 / 16期

关键词：

D O I：

10.1364/OE.16.012362

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We report on the in-situ controlled tuning of the particle gap in single pairs of gold nanodisks by photochemical metal deposition. The optically induced growth of nanodisk dimers fabricated by electron beam lithography leads to a decrease of the interparticle gap width down to 0 nm. Due to the increasing particle size and stronger plasmonic coupling, a smooth redshift of the localized surface plasmon (LSP) resonances is observed in such particle pairs during the growth process. The interparticle gap width, and hence the LSP resonance, can be tuned to any desired spectral position. The experimental results we obtain with this nanoscale fabrication technique are well described by the so-called plasmon ruler equation. Consequently, both the changes in particle diameter as well as in gap width can be characterized in-situ via far-field read-out of the optical properties of the dimers. (C) 2008 Optical Society of America.

引用

页码：12362 / 12371

页数：10