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Title: Structural and electro-optic properties of Ba[sub 0.7]Sr[sub 0.3]TiO₃ thin films grown on various substrates using pulsed laser deposition
Authors: Wang, Danyang
Wang, Jie
Chan, Helen L. W.
Choy, Chung-loong
Subjects: Barium compounds
Strontium compounds
Ferroelectric thin films
Epitaxial layers
Pulsed laser deposition
Crystal structure
Electro-optical effects
Issue Date: 23-Feb-2007
Publisher: American Institute of Physics
Source: Journal of applied physics, 23 Feb. 2007, v. 101, 043515, p. 1-6.
Abstract: Epitaxial Ba[sub 0.7]Sr[sub 0.3]TiO₃ (BST) thin films were deposited on various single crystal substrates, including LaAlO₃(LAO) (001), (LaAlO₃)[sub 0.3](Sr₂AlTaO[sub 6])[sub 0.35] (LSAT) (001), and SrTiO₃ (STO) (001), using pulsed laser deposition in order to study their structural and electro-optic properties. All the films exhibit a good crystalline quality and a pure perovskite phase with a distorted lattice structure. The in-plane temperature dependence of relative permittivity of the films was measured on interdigital electrodes. The films grown on LAO and LSAT exhibited an obvious room-temperature ferroelectric state, while the film grown on STO showed a broad phase transition peak near room temperature. Correspondingly, large linear electro-optic effects were observed in the BST films grown on LAO and LSAT in a transverse geometry at a wavelength of 632.8 nm using a modified Sénarmont method. The linear electro-optic coefficient r[sub c]of the BST films grown on LAO and LSAT was found to be 82.7 x 10ˉ¹² and 125.0 x 10ˉ¹² m/V, respectively. Nevertheless, a predominantly quadratic and slightly asymmetric electro-optic behavior is observed for the film grown on STO with the quadratic electro-optic coefficient R[sub c] of 12.9 x 10[sup -18] m²/V².
Rights: © 2007 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in D.Y. Wang et al. J. Appl. Phys. 101, 043515 (2007) and may be found at
Type: Journal/Magazine Article
ISSN: 0021-8979
Appears in Collections:MRC Journal/Magazine Articles
AP Journal/Magazine Articles

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