Experimental verification of the SERS electromagnetic model beyond the |E|4 approximation:: Polarization effects

被引：106

作者：

Le Ru, E. C. ^{[1
]}

Grand, J. ^{[2
]}

Felidj, N. ^{[2
]}

Aubard, J. ^{[2
]}

Levi, G. ^{[2
]}

Hohenau, A. ^{[3
]}

Krenn, J. R. ^{[3
]}

Blackie, E. ^{[1
]}

Etchegoin, P. G. ^{[1
]}

机构：

[1] Victoria Univ Wellington, MacDiarmid Inst Adv Mat & Nanotechnol, Sch Chem & Phys Sci, Wellington, New Zealand

[2] Univ Paris 07, Lab ITODYS, CNRS, UMR 7086, F-75005 Paris, France

[3] Karl Franzens Univ Graz, Inst Phys, A-8010 Graz, Austria

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2008年 / 112卷 / 22期

关键词：

D O I：

10.1021/jp802219c

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 failure of the so-called vertical bar E vertical bar(4) approximation of the surface-enhanced Raman scattering (SERS) electromagnetic (EM) enhancement factor is demonstrated experimentally using arrays of highly uniform gold nanoparticles specially designed for this purpose. This is first demonstrated for unpolarized detection, and the interpretation of the results then becomes evident by studying the case of polarized detection. These results provide, at the same time, a clear experimental verification of the generalized EM theory of SERS beyond the vertical bar E vertical bar(4) approximation (Chem. Phys. Lett. 2006, 423, 63). A nontrivial consequence of these concepts is the almost complete polarization rotation of the SERS signal with respect to the incident polarization. This occurs for a prolate nanoparticle with plasmon resonances peaking on either side of the main spectral range covered by the Raman spectrum of the probe. Finally, we discuss how such experiments can be used to extract some information about the molecular adsorption orientation of the probe.

引用

页码：8117 / 8121

页数：5

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