Regensburg 2000 – scientific programme
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DS: Dünne Schichten
DS 27: Optische Schichten II
DS 27.4: Fachvortrag
Wednesday, March 29, 2000, 17:45–18:00, H32
Vibration dynamics of silver nanoparticles — •S. Gresillon1, M. Perner1, G. von Plessen1, J. Feldmann1, J. Porstendorfer2, K.-J. Berg2 und G. Berg2 — 1Lehrstuhl für Photonik und Optoelektronik, Sektion Physik und CeNS, Ludwig-Maximilians-Universität München, Amalienstr. 54, 80799 München — 2Fachbereich Physik, Universität Halle-Wittenberg, Friedemann-Bach-Platz 6, 06108 Halle
We investigate the vibration dynamics of silver nanoparticles, using time-resolved optical pump-probe spectroscopy. When excited with femtosecond laser pulses, the particles execute size oscillations. We show that these vibrations are triggered by the thermal expansion of the optically heated particles. The time dependence of the vibrations indicates that this expansion is caused by two mechanisms: the lattice anharmonicity and the extremely large thermal pressure of the hot conduction electrons.