Time-resolved photodynamics of triangular-shaped silver nanoplates

被引：91

作者：

Bonacina, L ^{[1
]}

Callegari, A ^{[1
]}

Bonati, C ^{[1
]}

van Mourik, F ^{[1
]}

Chergui, M ^{[1
]}

机构：

[1] Ecole Polytech Fed Lausanne, EPFL, Lab Spect Ultrarapide, CH-1015 Lausanne, Switzerland

来源：

NANO LETTERS | 2006年 / 6卷 / 01期

关键词：

D O I：

10.1021/nl052131+

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We measured the ultrafast response of triangular silver nanoparticles upon femtosecond excitation of their plasmon resonance. After a fast electron relaxation, the signature of a bimodal mechanical vibration of the particle is apparent as a spectral modulation. We identify the two lowest frequency, totally symmetric vibrations of the particle as responsible for this modulation, through their influence on the plasmon peak position and width, in full agreement with the results of a variational elastodynamic model that is also presented. From the analysis of the phase we conclude that thermal expansion and electron pressure, respectively, are responsible for the excitation of the two vibrations.

引用

页码：7 / 10

页数：4

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