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Journal Articles Physical Review B: Condensed Matter and Materials Physics (1998-2015) Year : 2011

Vibrations of spherical core-shell nanoparticles

Abstract

The acoustic vibration modes of spherical composite nanoparticles formed by a core and an arbitrary number of shells are computed using a semianalytic approach based on elastic theory. The modes observed in time-resolved pump-probe experiments are identified in the case of metal-dielectric-based spherical composite nanoparticles, and results are illustrated in the case of Ag@SiO2 core-shell nanoparticles. The presence of a light dielectric shell is shown to only weakly shift the frequency of the dominant mode observed in time-resolved experiments. Moreover, a large impact of the mechanical contact between the different materials forming the particle on the vibrational mode frequency and damping is predicted, offering the possibility of experimentally addressing this parameter.
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hal-00598308 , version 1 (06-06-2011)

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Aurelien Crut, Vincent Juvé, Denis Mongin, Paolo Maioli, N. del Fatti, et al.. Vibrations of spherical core-shell nanoparticles. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2011, 83 (20), pp.205430. ⟨10.1103/PhysRevB.83.205430⟩. ⟨hal-00598308⟩
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