arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0705.1892nlin.PSphysics.optics
收藏

布拉格光栅中的光声孤子

Optoacoustic solitons in Bragg gratings

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

摘要:

光隙孤子是布拉格光栅非线性和色散平衡的产物,它可以通过电致伸缩与声波耦合。这就产生了一种新的“间隙声学”孤子(GAS),我们找到精确的解析解。GAS由类似于光隙孤子的光脉冲组成,由伴随的声子脉冲修饰。接近声速时,声子分量较大。在亚(超声)声孤子中,声子脉冲是正(负)密度变化。与声场的耦合抑制了孤子的振荡不稳定性,并使超声速孤子产生明显的不稳定性,这可能使气体减速并改变方向,最终使孤子成为亚声速孤子。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑