Optoacoustic solitons in Bragg gratings

Details Optoacoustic solitons in Bragg gratings Optoacoustic solitons in Bragg gratings

2007-05-14

arxiv.org/abs/0705.1892v2

Physical Review Letters 98, 243902 (2007)

Nonlinear Sciences

Pattern Formation and Solitons

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.98.243902

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.

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