Optoacoustic solitons in Bragg Gratings

Richard S. Tasgal, Y. B. Band, Boris A. Malomed

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


Optical gap solitons, which exist due to a balance of nonlinearity and dispersion due to a Bragg grating, can couple to acoustic waves through electrostriction. This gives rise to a new species of "gap-acoustic" solitons (GASs), for which we find exact analytic solutions. The GAS consists of an optical pulse similar to the optical gap soliton, dressed by an accompanying phonon pulse. Close to the speed of sound, the phonon component is large. In subsonic (supersonic) solitons, the phonon pulse is a positive (negative) density variation. Coupling to the acoustic field damps the solitons' oscillatory instability, and gives rise to a distinct instability for supersonic solitons, which may make the GAS decelerate and change direction, ultimately making the soliton subsonic.

Original languageEnglish
Article number243902
JournalPhysical Review Letters
Issue number24
StatePublished - 15 Jun 2007

ASJC Scopus subject areas

  • General Physics and Astronomy


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