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 27.119: Poster

Dienstag, 24. März 2009, 18:30–21:00, P2

Nanosecond time-resolved measurements of acoustic waves — •Fabian Kneier, Tobias Geldhauser, Johannes Boneberg, and Paul Leiderer — Fachbereich Physik, Universität Konstanz, 78457 Konstanz

We have built a Michelson interferometer that is capable of determining surface expansions and accelerations in the sub-nm range with a ns-temporal resolution. For that purpose the interferometer is stabilized by a piezoelectrically driven mirror in the reference arm. This setup is used to study Bulk Acoustic Waves (BAW) and their properties. This is achieved using a Nd:YAG laser to induce BAWs in a silicon wafer irradiating onto the back of the silicon wafer and measuring the surface displacement caused at the front surface. Included in our investigation are, for example, the effect of silicon wafer thickness or the effect of sacrificial layers of different materials on the back side of the wafer where the the BAW is generated. The information gained will be applied to get a deeper understanding of the underlying processes of dry-laser cleaning and particle adhesion on surfaces.