Regensburg 2013 – scientific programme
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O: Fachverband Oberflächenphysik
O 86: Plasmonics and Nanooptics VI
O 86.9: Talk
Friday, March 15, 2013, 12:30–12:45, H36
Time-resolved near field microscopy of a metal particles breathing oscillation — •Matthias Brandstetter1,2, Ralf Vogelgesang3, and Markus Lippitz1,2 — 1Max-Planck Institute for Solid State Research, Stuttgart, Germany — 2University Stuttgart, Germany — 3Carl von Ossietzky University Oldenburg, Deutschland
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 launches acoustical oscillations of the whole particle. The mechanical oscillations lead to a local variation in the dielectric properties. Using an apertureless SNOM in a pump-probe configuration, we locally probe these changes of the dielectric properties of a nanoparticle on the picosecond timescale. The spatial resolution is defined by the near-field microscope (about 10 nm). The temporal resolution is just limited by the duration of the laser pulse, in our case to about one picosecond. This new device will allow us to investigate ultrafast processes on the nanoscale. We present our combination of an apertureless scanning near-field microscope and a pump probe setup as well as experimental results.