Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 60: Poster Session IV (Solid/liquid interfaces; Semiconductors; Oxides and insulators; Graphene; Plasmonics and nanooptics; Electronic Structure; Surface chemical reactions; Heterogeneous catalysis)
O 60.80: Poster
Mittwoch, 16. März 2011, 17:30–21:00, P4
Time-Resolved Near-Field Microscopy of Acoustic Vibrations — •Matthias Brandstetter1,2, Ralf Vogelgesang1, and Markus Lippitz1,2 — 1Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany — 24th Physics Institute, University of Stuttgart,70550 Stuttgart, Germany
The localized surface plasmon resonance (LSPR) of a metal nanoparticle depends directly on the geometry and the dielectric constant of the nanoobject. The resonance is influenced by the electron density which can be modified locally by acoustic oscillations of the nanostructure. The optical near-field thus contains information on the structure's acoustic oscillation pattern. The combination of an apertureless scanning near-field optical microscope (aSNOM) and ultrafast pump-probe spectroscopy gives an instrument to detect the temporal and spatial dependence of the LSPR. We present our implementation of a pump-probe aSNOM which at the end will allow us to map out nanoscale mechanical oscillation patterns. We show numerical simulation of the field changes caused by local plasma frequency changes, nanoacoustical modes as well as first experimental results.