Berlin 2012 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 13: Poster II
DF 13.27: Poster
Mittwoch, 28. März 2012, 15:00–17:30, Poster E
Linear and non-linear optical properties of Lithium niobate — •Arthur Riefer1, Simone Sanna1, André V. Gavrilenko2, and Wolf Gero Schmidt1 — 1Theoretische Physik, Universität Paderborn, 33095 Paderborn, Germany — 2Norfolk State University, Center for Materials Research, VA 23504 Norfolk, USA
Lithium niobate (LN) is one of the most important ferroelectric materials and the most important optic material. Given the vast range of LN applications, our knowledge about its electronic and optical properties is surprisingly limited. Besides many experiments focusing on the onset of the absorption, we are aware of only two studies that address the absorption in the vacuum ultraviolet (VUV) domain [1,2]. Furthermore, theoretical works investigating the electronic and optical properties beyond the single-particle picture are rare[3,4]. Concerning the non-linear optical properties, only a single theoretical work exists [5]. Thus, in this work we use a quasiparticle band structure based on parameter-free GW calculations for setting up the excitonic Hamiltonian, determine the (linear) optical spectra, and compare to the experimental available spectra [1]. We also present a second-harmonic generation (SHG) spectrum for LN.
[1] A. M. Mamedov et al., Appl. Phys. A 34, 189 (1984)
[2] E. Wiesendanger et al., Sol. State Commun. 14, 303 (1974)
[3] W. G. Schmidt et al., Phys. Rev. B 77, 035106 (2008)
[4] C. Thierfelder et al., phys. stat. sol. (c) 7, 362 (2010)
[5] H. Akkus et al.,Int. J. Nanoelectronics and Materials 3, 53 (2010)