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DF: Fachverband Dielektrische Festkörper
DF 21: Nano- and microstructured dielectrics (Joint Session with KR)
DF 21.2: Vortrag
Donnerstag, 3. April 2014, 12:20–12:40, GER 37
Polarization-dependent second harmonic analysis of ferroelectric domain structures in z-cut lithium niobate — •Alex Widhalm1, Moritz Grothe1, Gerhard Berth1,2, and Artur Zrenner1,2 — 1Department Physik, Universität Paderborn, 33098 Paderborn, Germany — 2Center for Optoelectronics and Photonics Paderborn (CeOPP), 33098 Paderborn, Germany
Short-periodic domain grids in ferroelectric materials like lithium niobate (LN) are inevitable to achieve quasi phase matching for sophisticated applications in the visible spectral range. A deeper understand-ing of the physical processes involved in the periodic inversion of the spontaneous dielectric polarization is essential for guaranteeing sufficient quality of these domain structures. Within this work we study the nonlinear signature of the z-cut surface region of periodically poled LN with integrated Ti waveguide structures by means of second harmonic microscopy. In this context, the polarization-dependent SH-analysis has turned out to be an extremely high contrastive method for imaging the ferroelectric domain structure. In addition this technique enables directly the assignment of polarity. All in all, it has been proven that the occurring nonlinear signatures are essentially determined by the polarization and the tailored crystal structure.