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Applied Optics

Applied Optics


  • Vol. 39, Iss. 31 — Nov. 1, 2000
  • pp: 5847–5853

Enhanced Acousto-Optic Diffraction Efficiency in a Symmetric SrTiO3/BaTiO3/SrTiO3 Thin-Film Heterostructure

Ranu Nayak, Vinay Gupta, and Sreenivas Kondepudy  »View Author Affiliations

Applied Optics, Vol. 39, Issue 31, pp. 5847-5853 (2000)

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Guided-wave acousto-optic Bragg diffraction and surface acoustic-wave propagation in epitaxially matched SrTiO<sub>3</sub>/BaTiO<sub>3</sub>(001)/SrTiO<sub>3</sub> thin-film heterostructures have been theoretically studied. The optimum electromechanical coupling and Bragg diffraction efficiency have been determined at several acoustic frequencies by means of varying the thickness of the SrTiO<sub>3</sub> overlayer and the BaTiO<sub>3</sub> waveguiding layer. A strain-controlling nonpiezoelectric SrTiO<sub>3</sub> overlayer upon the BaTiO<sub>3</sub>/SrTiO<sub>3</sub> structure is found to enhance the coupling coefficient (<i>k</i><sup>2</sup>) and the diffraction efficiency significantly. A comparison of asymmetric and symmetric structures shows an increase in the diffraction efficiency from 10.5% to 43.0% and a decrease in the untuned-transducer conversion efficiency from 36 to 23 dB at an operating frequency of 1 GHz with an interaction length of 1 mm and an acoustic power of 1 mW.

© 2000 Optical Society of America

OCIS Codes
(160.1050) Materials : Acousto-optical materials
(230.1040) Optical devices : Acousto-optical devices
(230.4170) Optical devices : Multilayers
(240.0310) Optics at surfaces : Thin films
(240.6690) Optics at surfaces : Surface waves
(310.2790) Thin films : Guided waves

Ranu Nayak, Vinay Gupta, and Sreenivas Kondepudy, "Enhanced Acousto-Optic Diffraction Efficiency in a Symmetric SrTiO3/BaTiO3/SrTiO3 Thin-Film Heterostructure," Appl. Opt. 39, 5847-5853 (2000)

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