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DF: Fachverband Dielektrische Festkörper
DF 6: Optical and nonlinear optical properties, photonic
DF 6.1: Invited Talk
Tuesday, March 15, 2011, 10:15–10:55, MÜL Elch
Ultrafast X-ray Diffraction and all-optical Pump-Probe Spectroscopy on Oxide Multilayers — •Matias Bargheer — Institut für Physik und Astronomie, Universität Potsdam — Helmholtz-Zentrum Berlin
We present experimental results of ultrafast x-ray diffraction and ultrafast optical experiments that simultaneously measure optical reflection and transmission changes on various multilayer systems. The investigated multilayer samples include expitaxially grown oxides (STO, SRO, LSMO, PZT, BTO) with dielectric, metallic, ferromagnetic and ferroelectric character as well as polyelectrolyte multilayers with embedded gold nano-particles.
From the ultrafast x-ray techniques we assess the exact structural properties and structural changes. On the one hand we are able to measure transient relative changes of the lattice constant of STO as small as 10−7. On the other extreme, we can induce changes of the x-ray diffraction efficiency of 2500% on particular superlattice Bragg-reflections by launching strain-waves with an amplitude of 1.8%.
Broadband visible and infrared pump-probe experiments are used to measure the changes in the dielectric function. We show how the information determined from ultrafast structural measurements can help with the interpretation of all-optical spectroscopies.