Regensburg 2013 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 10: Optical and nonlinear optical properties, photonic
DF 10.3: Vortrag
Dienstag, 12. März 2013, 10:10–10:30, H11
Three-dimensional ferroelectric domain mapping in lithium niobate — •Thomas Kämpfe1, Mathias Schröder1, Philipp Reichenbach1, Alexander Haußmann1, Theo Woike2, and Lukas M. Eng1 — 1Institute of Applied Photophysics, Technical University Dresden, 01062 Dresden — 2Institute of Structural Physics, Technical University Dresden, 01062 Dresden
Ferroelectric domain walls (DWs) are an elegant new approach towards nanoelectric circuitry, as they intrinsically exhibit DW conduction within an insulating volume. The DW conductivity in Mg:LiNbO3 single crystals depends on the inclination [1], which is related to the poling conditions and doping concentration, effectively altering the wall pinning. For three-dimensional investigations of conductive DWs, we apply Cerenkov second-harmonic generation (CSHG) with adjustable fundamental wavelength in a range of 800 – 990 nm. This technique enables the noninvasive DW characterization throughout the whole crystals. Here, we report that conductive DWs have constant inclination throughout the whole crystal. The extracted inclination angles are in agreement with surface-sensitive PFM measurements in [1]. Besides this, the visualization of topological defects, e.g. the merging of two domains within the crystal or domains being completely embedded within the bulk, are shown.
M. Schröder et al., Adv. Funct. Mater., 22: 3936–3944 (2012)