Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 64: Plasmonics and nanooptics III
O 64.3: Vortrag
Donnerstag, 29. März 2012, 11:00–11:15, MA 005
Time resolved near-field microscopy of metal nanoparticles — •Matthias Brandstetter1,2, Ralf Vogelgesang1, and Markus Lippitz1,2 — 1Max-Planck Institut für Festkörperforschung, Stuttgart — 24. Physikalisches Institut, Universität Stuttgart
The localized surface plasmon resonance (LSPR) of a metal nanoparticle depends directly on the geometry and the dielectric constant of the nanoobject. Impulsive heating through a laser pulse periodically modulates the geometry of a nanoparticle. The mechanical oscillations launched by the laser pulse lead to a variation in the local electron density of the nanoparticle and therefore a local variation in the dielectric properties. Using an AFM tip as near-field scatterer, we locally detect these changes of the dielectric properties of a nanoparticle on the nanoscale. The confinement of the near-fields will allow us to explore the elastomechanical properties of nanoparticles with a spatial resolution of 20nm. We present our combination of an apertureless scanning near-field microscope and a pump probe setup as well as first experimental results.