Surface plasmon enhanced second harmonic response from gold clusters embedded in an alumina matrix

被引:60
作者
Antoine, R
Pellarin, M
Palpant, B
Broyer, M
Prevel, B
Galletto, P
Brevet, PF
Girault, HH
机构
[1] Univ Lyon 1, Spectrometrie Ion & Mol Lab, CNRS, F-69622 Villeurbanne, France
[2] Univ Lyon 1, CNRS, Dept Phys Mat, F-69622 Villeurbanne, France
[3] Ecole Polytech Fed Lausanne, Lab Electrochim, CH-1015 Lausanne, Switzerland
关键词
D O I
10.1063/1.368679
中图分类号
O59 [应用物理学];
学科分类号
摘要
The second order nonlinear response from 4 nm diam gold clusters embedded in an alumina matrix deposited on a pure silica substrate has been recorded as a function of the wavelength of the fundamental incident beam. The spectrum exhibits a narrow resonance band peaked at 520 nm as a result of the coupling of the second harmonic field with the surface plasmon of the particles. The nonlinear second harmonic response of gold clusters is found to be blueshifted compared to the bulk, due to the finite size effects on the cluster optical properties, as already observed with the linear response. Furthermore, this nonlinear response appears to be well described with a simple free electron model where the valence electrons only participate through the screening of the ionic cores, owing to the weakness of the interband transition contribution. (C) 1998 American Institute of Physics. [S0021-8979(98)01820-9]
引用
收藏
页码:4532 / 4536
页数:5
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