Issue 28, 2009
From the journal:

Physical Chemistry Chemical Physics

Anisotropy effects on the time-resolved spectroscopy of the acoustic vibrations of nanoobjects†

Aurélien Crut,*a   Paolo Maioli,a   Natalia Del Fattia  and  Fabrice Valléea  

* Corresponding authors

a FemtoNanoOptics Group, Université Lyon 1, CNRS, LASIM, 43 Bd du 11 Novembre 1918, Villeurbanne, France
E-mail: acrut@lasim.univ-lyon1.fr

Abstract

The impact of spherical symmetry breaking and crystallinity on the response of the vibrational acoustic modes of a nanoobject in frequency- and time-domain experiments is investigated using the finite-element analysis method. The results show that introduction of shape anisotropy, i.e., evolution from a nanosphere to a nanorod, modifies the periods of the fundamental radial and quadrupolar modes and leads to activation of a quadrupolar-like mode in time-domain studies. In contrast, crystallinity is shown to have a negligible impact on the breathing mode frequency of a nanosphere formed by a cubic crystal and does not activate any quadrupolar mode. The effect of an anisotropic excitation in time-resolved measurements of a large nanosphere is also discussed.

Graphical abstract: Anisotropy effects on the time-resolved spectroscopy of the acoustic vibrations of nanoobjects

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Article information

DOI
https://doi.org/10.1039/B902107H
Article type
Paper
Submitted
02 Feb 2009
Accepted
17 Mar 2009
First published
21 Apr 2009

Phys. Chem. Chem. Phys., 2009,11, 5882-5888

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Anisotropy effects on the time-resolved spectroscopy of the acoustic vibrations of nanoobjects

A. Crut, P. Maioli, N. D. Fatti and F. Vallée, Phys. Chem. Chem. Phys., 2009, 11, 5882 DOI: 10.1039/B902107H

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