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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Editor: Grover Swartzlander
  • Vol. 30, Iss. 10 — Oct. 1, 2013
  • pp: 2657–2664

Acoustic confinement and stimulated Brillouin scattering in integrated optical waveguides

Christopher G. Poulton, Ravi Pant, and Benjamin J. Eggleton  »View Author Affiliations

JOSA B, Vol. 30, Issue 10, pp. 2657-2664 (2013)

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We examine the effect of acoustic mode confinement on stimulated Brillouin scattering (SBS) in optical waveguides that consist of a guiding core embedded in a solid substrate. We find that SBS can arise due to coupling to acoustic modes in three different regimes. First, the acoustic modes may be guided by total internal reflection; in this case, the SBS gain depends directly on the degree of confinement of the acoustic mode in the core, which is in turn determined by the acoustic V parameter. Second, the acoustic modes may be leaky but may nevertheless have a sufficiently long lifetime to have a large effect on the SBS gain; the lifetime of acoustic modes in this regime depends not only on the contrast in acoustic properties between the core and the cladding but is also highly dependent on the waveguide dimensions. Finally, SBS may occur due to coupling to free modes, which exist even in the absence of acoustic confinement; we find that the cumulative effect of coupling to these nonconfined modes results in significant SBS gain. We show how the different acoustic properties of core and cladding lead to these different regimes and discuss the feasibility of SBS experiments using different material systems.

© 2013 Optical Society of America

OCIS Codes
(190.0190) Nonlinear optics : Nonlinear optics
(190.2640) Nonlinear optics : Stimulated scattering, modulation, etc.

ToC Category:
Nonlinear Optics

Original Manuscript: May 30, 2013
Revised Manuscript: August 17, 2013
Manuscript Accepted: August 20, 2013
Published: September 12, 2013

Christopher G. Poulton, Ravi Pant, and Benjamin J. Eggleton, "Acoustic confinement and stimulated Brillouin scattering in integrated optical waveguides," J. Opt. Soc. Am. B 30, 2657-2664 (2013)

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