期刊
ACS NANO
卷 10, 期 2, 页码 2251-2258出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b06904
关键词
ultrafast spectroscopy; coherent oscillations; metal nanoparticles
类别
资金
- European Commission [604391]
- European Research Council (ERC) [279985, 2013-1 REPLICA2 619448, 2013-2 KNOTOUGH 632277]
- Provincia Autonoma di Trento [S116/2012-242637, 2266]
- French RENATECH Network
Mechanical vibrational resonances in metal nanoparticles are intensively studied because they provide insight into nanoscale elasticity and for their potential application to ultrasensitive mass detection. In this paper, we use broadband femtosecond pump-probe spectroscopy to study the longitudinal acoustic phonons of arrays of gold nanorods with different aspect ratios, fabricated by electron beam lithography with very high size uniformity. We follow in real time the impulsively excited extensional oscillations of the nanorods by measuring the transient shift of the localized surface plasmon band. Broadband and high-sensitivity detection of the time-dependent extinction spectra enables one to develop a model that quantitatively describes the periodic variation of the plasmon extinction coefficient starting from the steady-state spectrum with only one additional free parameter. This model allows us to retrieve the time-dependent elongation of the nanorods with an ultrahigh sensitivity and to measure oscillation amplitudes of just a few picometers and plasmon energy shifts on the order of 10(-2) meV.
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