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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN 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)
http://dx.doi.org/10.1364/AO.39.005847


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Abstract

Guided-wave acousto-optic Bragg diffraction and surface acoustic-wave propagation in epitaxially matched SrTiO3/BaTiO3(001)/SrTiO3 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 SrTiO3 overlayer and the BaTiO3 waveguiding layer. A strain-controlling nonpiezoelectric SrTiO3 overlayer upon the BaTiO3/SrTiO3 structure is found to enhance the coupling coefficient (k2) 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

History
Original Manuscript: January 27, 2000
Revised Manuscript: June 26, 2000
Published: November 1, 2000

Citation
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)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-39-31-5847

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