Large-area plasmonic hot-spot arrays: sub-2 nm interparticle separations with plasma-enhanced atomic layer deposition of Ag on periodic arrays of Si nanopillars

被引：53

作者：

Caldwell, Joshua D. ^{[1
]}

Glembocki, Orest J. ^{[1
]}

Bezares, Francisco J. ^{[1
]}

Kariniemi, Maarit I. ^{[2
]}

Niinisto, Jaakko T. ^{[2
]}

Hatanpaa, Timo T. ^{[2
]}

Rendell, Ronald W. ^{[1
]}

Ukaegbu, Maraizu ^{[3
]}

Ritala, Mikko K. ^{[2
]}

Prokes, Sharka M. ^{[1
]}

Hosten, Charles M. ^{[3
]}

Leskela, Markku A. ^{[2
]}

Kasica, Richard ^{[4
]}

机构：

[1] USN, Res Lab, Washington, DC 20375 USA

[2] Univ Helsinki, Dept Chem, Inorgan Chem Lab, FI-00014 Helsinki, Finland

[3] Howard Univ, Dept Chem, Washington, DC 20059 USA

[4] CNST NIST, Gaithersburg, MD 20899 USA

来源：

OPTICS EXPRESS | 2011年 / 19卷 / 27期

基金：

芬兰科学院;

关键词：

SILVER THIN-FILMS; RAMAN-SCATTERING; NANOSPHERE LITHOGRAPHY; GOLD NANOPARTICLE; SPECTROSCOPY; MOLECULES; THIOPHENOL; ELECTRODE; SURFACES;

D O I：

10.1364/OE.19.026056

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Initial reports of plasmonic 'hot-spots' enabled the detection of single molecules via surface-enhanced Raman scattering (SERS) from random distributions of plasmonic nanoparticles. Investigations of systems with near-field plasmonically coupled nanoparticles began, however, the ability to fabricate reproducible arrays of such particles has been lacking. We report on the fabrication of large-area, periodic arrays of plasmonic 'hot-spots' using Ag atomic layer deposition to overcoat Si nanopillar templates leading to reproducible interpillar gaps down to <2 nm. These plasmonic 'hot-spots' arrays exhibited over an order of magnitude increase in the SERS response in comparison to similar arrays with larger interpillar separations. (C) 2011 Optical Society of America

引用

页码：26056 / 26064

页数：9

共 27 条

[1] Metal-adsorbate hybridized electronic states and their impact on surface enhanced Raman scattering [J].