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<dc:title xml:lang="fr">Magnéto-acoustique ultra rapide dans des nanoparticules métalliques</dc:title>
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<dc:subject xml:lang="fr">Nanoparticules</dc:subject>
<dc:subject xml:lang="fr">Résonance plasmonique de surface</dc:subject>
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<dc:subject xml:lang="fr">Magnétisme</dc:subject>
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<dc:subject xml:lang="en">Ultra fast acoustics</dc:subject>
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<dcterms:abstract xml:lang="fr">Dans cette thèse, nous avons étudié les propriétés dynamiques de plasmons de surface couplés à un champ magnétique et à des phonons acoustiques. Une technique de spectroscopie pompe-sonde résolu temporelle a été utilisée. Un couplage magnéto-optique de la résonance plasmonique avec un champ magnétique a été étudié dans une monocouche de nanoparticules d'or à proximité du SPR. Une contribution importante a été observée autour de la transition interbande. Nous proposons que cet effet est dû à un grand couplage spin-orbite dans l’Or. De l'autre côté, une impulsion acoustique picoseconde générée dans un transducteur induit une modulation de la réflectivité transitoire des nanoparticules d'or auto-assemblées. Deux modes acoustiques, présentés dans les signaux dynamiques, sont rapportés et analysés. Nous démontrons qu'une impulsion acoustique ultracourte est capable d'exciter le mode quadripôle sphéroïdal. Nous expliquons également la génération d'oscillations à basse fréquence.</dcterms:abstract>
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