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Dependence of Electro-Optic Effects on the Orientations of Epitaxial LiNbO3 Films

Published online by Cambridge University Press:  15 February 2011

See-Hyung Lee ,
T. W. Noh  and
Jai-Hyung Lee
See-Hyung Lee
Affiliation:
Department of Physics and Condensed Matter Research Institute, Seoul National University, Seoul 151–742, Korea
T. W. Noh
Affiliation:
Department of Physics and Condensed Matter Research Institute, Seoul National University, Seoul 151–742, Korea
Jai-Hyung Lee
Affiliation:
Department of Physics and Condensed Matter Research Institute, Seoul National University, Seoul 151–742, Korea
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Abstract

Epitaxial LiNbO3 films were grown on a-cut sapphire, i.e., α-A12O3(0112), substrates by pulsed laser deposition. It is found the oxygen pressure is an important deposition parameter to influence the orientations of the LiNbO3 films. At an oxygen pressure of 10−1 torr, LiNbO3(0001) film was grown epitaxially. And, at a low oxygen pressure (i.e., 5x10−4 torr), LiNbO3(1120) film was grown epitaxially. Due to the anisotropic electro-optic (EO) constants, these films with the different orientations display large differences in their EO properties: the epitaxial LiNb3(0001) film shows little EO effects, but the LiNbO3(1120) film shows a large quadratic EO behavior with an effective coefficient of 2.38×10−5 m2/V2. The dependence of EO effects on the orientations of the epitaxial films was analyzed in terms of the linear and quadratic EO tensors of LiNbO3.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 401: Symposium G – Epitaxial Oxide Thin Films II , 1995 , 261
Copyright
Copyright © Materials Research Society 1996

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