Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 59: Poster Session II (Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: arrays; Nanostructures at surfaces: Wires, tubes; Nanostructures at surfaces: Other; Plasmonics and nanooptics; Metal substrates: Epitaxy and growth; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsoprtion of organic / bio molecules; Metal substrates: Adsoprtion of inorganic molecules; Metal substrates: Adsoprtion of O and/or H; Metal substrates: Clean surfaces; Density functional theory and beyond for real materials)
O 59.32: Poster
Mittwoch, 24. März 2010, 17:45–20:30, Poster B1
Acousto-Plasmonic Properties of Single Metal Nanoparticles — •Kai Kratzer1,2, Thorsten Schumacher1,2, and Markus Lippitz1,2 — 1Max-Planck-Institut für Festkörperforschung, Stuttgart — 24. Physikalisches Institut, Universität Stuttgart
Acoustic vibrations of a single metal nanoparticle are detectable via the particle's plasmonic properties because mechanical oscillations cause a periodical variation of the electron density and thus a periodically changing plasmon resonance. Ultrafast pump-probe spectroscopy allows us to measure these small variations and to characterize a single nanoparticle by analyzing the acoustic breathing mode on a pico-second timescale.
Metal nanoparticles show a diverse behavior as they vary in shape, size and coupling to the substrate. To overcome this inhomogeneity it is necessary to measure single particles. We demonstrate these variations by a series of experiments on the single particle level and show the influence of deviations from spherical shape and the coupling to the substrate.