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DS: Fachverband Dünne Schichten

DS 17: Poster Session I

DS 17.48: Poster

Dienstag, 13. März 2018, 18:15–20:15, Poster B

Quantitative disentanglement of fully controllable coherent and incoherent laser-induced surface deformations by time-resolved x-ray reflectivity — •Marc Herzog¹, Mathias Sander¹, Jan-Etienne Pudell¹, Matias Bargheer^1,2, Roman Bauer³, Valentin Besse⁴, Vasily Temnov^4,5, and Peter Gaal³ — ¹Institut für Physik und Astronomie, Universität Potsdam, Germany — ²Helmholtz-Zentrum Berlin für Materialien und Energie, Germany — ³Institut für Festkörper- und Nanostrukturphysik, Universität Hamburg, Germany — ⁴IMMM CNRS 6283, Université du Maine, 72085 Le Mans cedex, France — ⁵CNRS UMR 8635, Université Paris-Sacley, 78035 Versailles cedex, France

High-frequency surface acoustic waves (SAWs) are not only present in any mobile phone, they are a powerful tool for fundamental research, e.g., to investigate the coupling of the lattice to other degrees of freedom in solids. SAWs with specific wavevectors can be generated by transient grating (TG) excitation using ultrashort laser pulses. In absorbing media, however, most of the optical excitation energy is deposited as incoherent, thermal strain. By using time-resolved x-ray reflectivity, we measure and decompose the absolute amplitudes of these transient coherent and incoherent periodic surface distortions which is very challenging using all-optical experiments. Moreover, we refine the TG technique to get full spatiotemporal coherent control of both coherent and incoherent excitations individually in order to suppress or enhance whatever is of primary interest.