https://doi.org/10.1140/epjs/s11734-023-00811-x
Regular Article
Coherent acoustic pulse emission by ensembles of plasmonic nanoparticles
1
Université Jean Monnet Saint-Etienne, CNRS, Institut d Optique Graduate School, Laboratoire Hubert Curien UMR 5516, 42023, Saint-Etienne, France
2
FemtoNanoOptics group, Université de Lyon, CNRS, Université Claude Bernard Lyon 1, Institut Lumière Matière, 69622, Villeurbanne, France
3
Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, 13013, Marseille, France
h
nathalie.destouches@univ-st-etienne.fr
Received:
15
April
2022
Accepted:
10
March
2023
Published online:
27
March
2023
The ability of a layer of silver nanoparticles with broad size dispersion to excite coherent acoustic phonon wave-packet in its supporting glass substrate following femtosecond laser excitation is tested using time-domain Brillouin scattering in transmission configuration. The generation and propagation over several micrometer distances of gigahertz acoustic phonons in the underlying glass is observed for all investigated samples, involving nanoparticle layers with different morphological properties. The phonon wave-packet exhibits frequency-dependent attenuation rates and amplitudes in the 40–50 GHz acoustic frequency region. The measured attenuation rates are consistent with previous experimental results on silica, indicating that anharmonic interaction of acoustic waves with the thermal phonon bath has dominating contribution to the phonon damping. The features of the acoustic waves emitted by a discontinuous nanoparticle layer are investigated using a simplified theoretical model, allowing to better understand at which condition they are similar to those of the waves emitted by a continuous thin film.
Supplementary Information The online version contains supplementarys material available at https://doi.org/10.1140/epjs/s11734-023-00811-x.
Ultrafast Phenomena from attosecond to picosecond timescales: theory and experiments. Guest editors: Franck Lépine, Lionel Poisson.
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© The Author(s), under exclusive licence to EDP Sciences, Springer-Verlag GmbH Germany, part of Springer Nature 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
