Surface and Interface Effects on the Dielectric Polarization and Refractive Indices of BaTiO3 Single Crystals and Ultrathin Films

被引:0
作者
Chaib, H. [1 ]
Eng, L. M. [2 ]
Nafidi, A. [3 ]
Khalal, A. [3 ]
Tirbiyine, A. [4 ]
Taoufik, A. [4 ]
机构
[1] Ibn Zohr Univ, Polydisciplinary Fac, POB 83, Ouarzazate 45002, Morocco
[2] Tech Univ Dresden, Inst Appl Photophys, D-01062 Dresden, Germany
[3] Ibn Zohr Univ, Condensed Matter Phys Grp, Agadir, Morocco
[4] Ibn Zohr Univ, Fac Sci, Grp High Critical Temperature Supercond, Agadir, Morocco
来源
2009 INTERNATIONAL CONFERENCE ON MULTIMEDIA COMPUTING AND SYSTEMS (ICMCS 2009) | 2009年
关键词
BaTiO3; dielectric polarization; refractive index; SrTiO3; surface effect; thin film; EPITAXIAL BATIO3/SRTIO3 SUPERLATTICES; THIN-FILM; FERROELECTRIC TRANSITION; 2ND-HARMONIC GENERATION; OPTICAL-PROPERTIES; PHASE-TRANSITION; ENHANCEMENT; TITANATE; THICKNESS;
D O I
10.1109/MMCS.2009.5256694
中图分类号
TP3 [计算技术、计算机技术];
学科分类号
0812 ;
摘要
The surface and interface effects on the dielectric polarization and refractive indices of BaTiO3 single crystals and BaTiO3 ultrathin films on SrTiO3 single crystal substrates are investigated theoretically by using a microscopic model based on the orbital approximation in correlation with the dipole-dipole interaction. The spontaneous polarization of BaTiO3 single crystals is drastically reduced near the c-surface. For BaTiO3/SrTiO3 films, the spontaneous polarization is reduced in the film as its thickness decreases. However, an electronic polarization appears within the SrTiO3 substrate in the neighborhood of the interface. This polarization, which vanishes far away from the interface into the SrTiO3 bulk, is induced by the polarization of the BaTiO3 film. Furthermore, we find the refractive index either for BaTiO3 single crystals or for BaTiO3 films and SrTiO3 substrates to be strongly reduced for light polarized perpendicular to the surface.
引用
收藏
页码:240 / +
页数:2
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