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Journal Articles Physical Chemistry Chemical Physics Year : 2009

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

Abstract

The impact of spherical symmetry breaking and rystallinity 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.

Dates and versions

hal-00441497 , version 1 (16-12-2009)

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Aurélien Crut, Paolo Maioli, Natalia del Fatti, Fabrice Vallée. Anisotropy effects on the time-resolved spectroscopy of the acoustic vibrations of nanoobjects. Physical Chemistry Chemical Physics, 2009, 11 (28), pp.5882. ⟨10.1039/b902107h⟩. ⟨hal-00441497⟩
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