Nonlinear Sciences > Pattern Formation and Solitons
[Submitted on 14 May 2007 (v1), last revised 20 Jun 2007 (this version, v2)]
Title:Optoacoustic solitons in Bragg gratings
View PDFAbstract: 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.
Submission history
From: Richard Tasgal [view email][v1] Mon, 14 May 2007 08:34:40 UTC (207 KB)
[v2] Wed, 20 Jun 2007 15:58:55 UTC (207 KB)
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