Comparison of finite-difference time-domain simulations and experiments on the optical properties of gold nanoparticle arrays on gold film

被引：13
作者：
Hohenau, Andreas [1 ]
Krenn, Joachim R.
Garcia-Vidal, Francisco J.
Rodrigo, Sergio G.
Martin-Moreno, Luis
Beermann, Jonas
Bozhevolnyi, Sergey I.
机构：
[1] Karl Franzens Univ Graz, A-8010 Graz, Austria
[2] Erwin Schrodinger Inst Nanoscale Res, A-8010 Graz, Austria
[3] Univ Autonoma Madrid, Dept Fis Teor Mat Condensada, E-28049 Madrid, Spain
[4] Univ Zaragoza, ICMA, CSIC, Dept Fis Mat Condensada, E-50009 Zaragoza, Spain
[5] Aalborg Univ, Dept Phys & Nanotechnol, DK-9220 Aalborg, Denmark
来源：
JOURNAL OF OPTICS A-PURE AND APPLIED OPTICS | 2007年 / 9卷 / 09期
关键词：
surface plasmons; FDTD; nanoparticles; particle array; grating coupling; two-photon luminescence; optical near-field;
D O I：
10.1088/1464-4258/9/9/S14
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We present experimental and simulated results of far-field reflection spectroscopy and two-photon luminescence microscopy of arrays of gold nanoparticles on gold film. These arrays are intended as a simplified model system compared to random arrangements of gold particles on gold film, which show huge surface enhancements for, e. g., Raman scattering of adsorbed molecules, related to the enhanced optical near-fields. By a detailed comparison of the experimental results to the finite-difference time-domain simulations (without free fitting parameters), we can identify the modes responsible for the enhancement in intensity on the investigated substrates. The qualitative and quantitative validity of the theoretical approach is addressed and we discuss the origin of the observed differences between theory and experiment as well as possible routes to overcome them.
引用
收藏
页码：S366 / S371
页数：6
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