Regensburg 2013 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

DF: Fachverband Dielektrische Festkörper

DF 10: Optical and nonlinear optical properties, photonic

DF 10.4: Vortrag

Dienstag, 12. März 2013, 10:30–10:50, H11

Linear and nonlinear optical properties of congruent LiNbO3 — •Arthur Riefer, Simone Sanna, and Wolf Gero Schmidt — Theoretische Physik, Universität Paderborn, Warburger Str. 100, 33100 Paderborn, Germany

Lithium niobate (LN) is one of the most important ferroelectric materials and the most important optical material. Recently, the linear [1,2,3] and nonlinear [3,4] optical properties of highly ordered stoichiometric LN have been investigated theoretically. However, the technologically relevant material is the congruently melting LN (CLN), containing up to 6% empty Li sites. In this work, we have investigated the linear and the nonlinear optical properties of congruent LN from first-principles. Thereby CLN is simulated both within the established Li and the Nb site vacancy models [5]. Our approach allows us to calculate the dielectric function as well as the second harmonic generation spectra within the independent particle approximation. The influence of the intrinsic defects on the optical and electronic properties of LN is discussed. The results are compared with experimental measurements [6].

[1] W. G. Schmidt et al., Phys. Rev. B 77, 035106 (2008)

[2] C. Thierfelder et al., phys. stat. sol. (c) 7, 362 (2010)

[3] A. Riefer et al., IEEE Trans. on Ultrasonics, Ferroelectrics and Frequency Control 59, 1929 (2012).

[4] S. Cabuk, Central European Journal of Physics 10, 239 (2012)

[5] T. Volk et al., Lithium Niobate, Berlin Springer, 2008

[6] D.A. Roberts, IEEE J. of Quantum Electronics 28, 2057 (1992)