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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 45, Iss. 9 — Mar. 20, 2006
  • pp: 1972–1978

Fabrication and characterization of epitaxial Ba0.7Sr0.3TiO3 thin films for optical waveguide applications

Dan-Yang Wang, Helen Lai Wa Chan, and Chung Loong Choy  »View Author Affiliations

Applied Optics, Vol. 45, Issue 9, pp. 1972-1978 (2006)

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The optical properties of barium strontium titanate (Ba 0 .7 Sr 0 .3 TiO 3 ; BST) thin films are described. The BST thin films were epitaxially grown upon MgO (001) substrates by pulsed laser deposition. The crystallographic properties of the BST thin films were examined by x-ray diffraction. The BST thin films were highly optically transparent in the visible region. The optical waveguide properties were characterized by a prism coupling technique. An inverse-WBK method was employed to determine the refractive-index profile along the thickness of the BST films. Optical losses were measured by a moving fiber method, and the optical losses were found to be 0.93 dB / cm for the TE 0 mode and 1.29 dB / cm for the TM 0 mode at 1550 nm . Electro-optic (E-O) properties were measured by a phase-modulation detection method at 632.8 nm, and the BST films exhibited a predominantly quadratic E-O effect with a quadratic E-O coefficient of 6.64 × 10 18 m 2 / V 2 .

© 2006 Optical Society of America

OCIS Codes
(160.2100) Materials : Electro-optical materials
(230.7390) Optical devices : Waveguides, planar
(310.6860) Thin films : Thin films, optical properties

ToC Category:
Thin Films

Original Manuscript: January 24, 2005
Manuscript Accepted: October 10, 2005

Dan-Yang Wang, Helen Lai Wa Chan, and Chung Loong Choy, "Fabrication and characterization of epitaxial Ba0.7Sr0.3TiO3 thin films for optical waveguide applications," Appl. Opt. 45, 1972-1978 (2006)

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