Regensburg 2013 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 28: Layer Properties: Electrical, Optical, and Mechanical Properties
DS 28.8: Vortrag
Donnerstag, 14. März 2013, 11:30–11:45, H8
Attenuation of coherent longitudinal acoustic phonons in free-standing gold-membranes — •Alexandra Frik1, Mike Hettich1, Oliver Ristow1, Martin Großmann1, Axel Bruchhausen2, Martin Schubert1, and Thomas Dekorsy1 — 1Department of Physics and Center of Applied Photonics, University of Konstanz, 78457 Konstanz, Germany — 2Instituto Balseiro & Centro Atomico Bariloche (CNEA), and CONICET, Argentina
The damping time of coherent longitudinal acoustic phonons in free standing gold membranes is measured by high speed asnchronous optical sampling (ASOPS) [1], a modified femtosecond pump probe spectroscopy method. We investigate the frequency dependence of the fundamental thickness mode lifetime by varying the membrane thickness. In addition, we study the influence of the surface roughness on the mode lifetimes. Temperature dependent measurements allow us to seperate the intrinsic damping mechanisms from surface contributions. The free-standing membranes were produced by thermal evaporating and where subsequently placed on a TEM-grid by a floating technique.
[1] A. Bartels Entwicklung von Femtosekundenlasern mit Repetitionsraten oberhalb 1 GHz und ihre Anwendungen Shaker Verlag Aachen, ISBN: 3-8265-8400-7 (2001)