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Integrated Ferroelectrics
An International Journal
Volume 88, 2007 - Issue 1
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SECTION I: MEMS, PYROELECTRIC/IR, OPTOELECTRONIC MATERIALS: THIN-FILM PROCESSING

LINEAR ELECTRO-OPTIC EFFECT IN Ba0.7Sr0.3TiO3 THIN FILM GROWN ON LSAT (001) SUBSTRATE

D. Y. WANG Department of Applied Physics and Materials Research Centre, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
,
J. WANG Department of Applied Physics and Materials Research Centre, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
,
H. L. W. CHAN Department of Applied Physics and Materials Research Centre, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
&
C. L. CHOY Department of Applied Physics and Materials Research Centre, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
Pages 12-20 | Received 31 May 2006, Published online: 12 Oct 2011
 
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ABSTRACT

Heteroepitaxial barium strontium titanate (Ba0.7Sr0.3TiO3 or BST) thin films were successfully grown on (LaAlO3)0.3(Sr2AlTaO6)0.35 (LSAT) (001) using pulsed laser deposition. X-ray diffraction characterization revealed that the films have a good crystalline quality and a pure perovskite structure. The in-plane ferroelectric properties of the films were studied using interdigital electrodes (IDE). The film exhibited a ferroelectric state at room temperature with the remnant polarization P r = 10.5 μC/cm2. A large linear electro-optic effect was observed in the Ba0.7Sr0.3TiO3 thin film in a transverse geometry at a wavelength of 632.8 nm using a modified Sénarmont method. The linear electro-optic coefficient r c of the Ba0.7Sr0.3TiO3 thin film was found to be 125.0 × 10−12 m/V, which is very promising for modulator applications.

ACKNOWLEDGMENT

Financial support from the Centre for Smart Materials of The Hong Kong Polytechnic University is acknowledged.

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