STRUCTURAL AND ELECTROOPTIC PROPERTIES OF BATIO3 THIN-FILMS GROWN BY PULSED-LASER DEPOSITION ON SRTIO3 SUBSTRATES

Ferroelectric BaTiO3 thin films was epitaxially grown by pulsed laser deposition on BaTiO3(100) and SrTiO3(110) substrates. By x-ray theta-2theta scan and pole figure measurements, it was confirmed that the BaTiO3 films were grown epitaxially along (100) direction on BaTiO3(100) substrate and along (110) direction on SrTiO3(110) substrate. Surface morphology was studied by an atomic force microscopy. The linear birefringence of the films shows a quadratic dependence of applied electric fields. By considering the index ellipsoid in the presence of applied electric fields, we interprete these effective quadratic electro-optic behaviors in terms of a linear electro-optic coefficient for BaTiO3.