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arXiv 0909.4820nlin.PS
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二维光子晶格中扩展S=2涡旋的几何稳定性:理论分析、数值计算和实验结果

Geometric stabilization of extended S=2 vortices in two-dimensional photonic lattices: theoretical analysis, numerical computation and experimental results

K. J. H. Law, D. Song, P. G. Kevrekidis, J. Xu, Zhigang Chen

摘要:

本文主要研究二维光子晶格中S=2(双电荷)涡旋的非线性离散自陷问题,包括理论分析、数值计算和实验验证。我们重新审视了早期的研究结果S=2涡旋与离散模型,并发现S=2涡旋扩展超过8个晶格网站确实可以是稳定的(或只有弱不稳定)在一定条件下,不仅为立方非线性先前使用,但也为饱和非线性更相关的我们的实验与偏置的光折变非线性晶体。然后,我们使用离散分析作为指导,对数值识别稳定(和不稳定)的旋涡解决方案,在一个更现实的连续模型与周期性的潜力。最后,我们给出了在自聚焦和自散焦非线性条件下,光诱导晶格中这种几何扩展的S=2涡旋孤子的实验观察,并清楚地表明,S=2涡旋奇异性在非线性传播过程中保持不变。

英文摘要:

In this work, we focus our studies on the subject of nonlinear discrete self-trapping of S=2 (doubly-charged) vortices in two-dimensional photonic lattices, including theoretical analysis, numerical computation and experimental demonstration. We revisit earlier findings about S=2 vortices with a discrete model, and find that S=2 vortices extended over eight lattice sites can indeed be stable (or only weakly unstable) under certain conditions, not only for the cubic nonlinearity previously used, but also for a saturable nonlinearity more relevant to our experiment with a biased photorefractive nonlinear crystal. We then use the discrete analysis as a guide towards numerically identifying stable (and unstable) vortex solutions in a more realistic continuum model with a periodic potential. Finally, we present our experimental observation of such geometrically extended S=2 vortex solitons in optically induced lattices under both self-focusing and self-defocusing nonlinearities, and show clearly that the S=2 vortex singularities are preserved during nonlinear propagation.

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。

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