Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 27: Poster Session I (Methods: Scanning probe techniques; Methods: Atomic and electronic structure; Methods: Molecular simulations and statistical mechanics; Oxides and Insulators: Clean surfaces; Oxides and Insulators: Adsorption; Oxides and Insulators: Epitaxy and growth; Semiconductor substrates: Clean surfaces; Semiconductor substrates: Epitaxy and growth; Semiconductor substrates: Adsorption; Nano- optics of metallic and semiconducting nanostructures; Electronic structure; Methods: Electronic structure theory; Methods: other (experimental); Methods: other (theory); Solutions on surfaces; Epitaxial Graphene; Surface oder interface magnetism; Phase transitions; Time-resolved spectroscopies)
O 27.69: Poster
Dienstag, 24. März 2009, 18:30–21:00, P2
Time-Resolved Near-Field Microscopy of Acoustic Vibrations — •Thorsten Schumacher1,2, Markus Lippitz1,2, Ralf Vogelgesang1, Jens Dorfmüller1, and Klaus Kern1 — 1Max-Planck-Institute for Solid State Research, Stuttgart - Germany — 24th Physics Institute, University of Stuttgart, Stuttgart - Germany
The localized surface plasmon resonance (LSPR) of metal nanoparticles depends directly on the geometry and the dielectric constant of the nanoobject. The resonance is influenced by the electron density which can be modified by acoustic oscillations of the nanostructure. The optical near-field thus contains information on the structure’s acoustic oscillation.
The combination of apertureless scanning near-field optical microscopy (aSNOM) and ultrafast pump-probe spectroscopy allows 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 Chladni figures. We show numerical simulation of the field changes caused by local plasma frequency changes, nanoacoustical modes as well as first experimental results.