Berlin 2001 – wissenschaftliches Programm
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Q: Quantenoptik
Q 13: Nonlinear Optics I
Q 13.4: Vortrag
Dienstag, 3. April 2001, 16:30–16:45, H 2013
SHG studies of nanostructured ferroelectric thin films — •Gerhard Seifert1, Georg Woltersdorf1, Heinrich Graener1, Alain Pignolet2, Ho Nyung Lee2, and Dietrich Hesse2 — 1Fachbereich Physik, Martin-Luther-Universität Halle-Wittenberg — 2Max-Planck-Institut für Mikrostrukturphysik, Halle
Ferroelectric crystals are currently being discussed as promising new materials for future, non-volatile memory devices (FRAM = ferroelectric random access memory). Important examples for this type of materials are SrBi2Ta2O9 (SBT) or BaBi4Ti4O15 (BBiT), which have a Perowskite-like crystal structure. Using pulsed laser deposition, thin films of these materials can be epitaxially grown, which contain nanometer-sized crystal grains on the surface. We have studied the nonlinear optical coefficients and the spatial distribution of these grains optically by measuring the second harmonic generation of a 100fs Ti:Sapphire laser at the surface of the samples. Varying both incidence and azimuthal angle and registering the produced SHG with polarization resolution, the texture and orientational distribution of the crystallites can be determined. The method should be feasible for the non-destructive in-situ control during the growth process of these materials.