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arXiv 1202.0830nlin.PSphysics.optics
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具有散焦饱和非线性和交替耦合的一维波导阵列中的暗格子孤子

Dark lattice solitons in one-dimensional waveguide arrays with defocusing saturable nonlinearities and alternating couplings

Andrey Kanshu, Christian E. Rüter, Detlef Kip, Jesús Cuevas, Panayotis G. Kevrekidis

摘要:

在目前的工作中,我们研究“二进制”波导阵列,其中相邻站点之间的耦合交替在两个不同的值$C_1$和$C_2$和饱和非线性存在于每个站点。出于这种类型的系统在制造铌酸锂$_3$阵列的实验研究,我们着手分析的非线性波激发自散焦非线性制度,检查,特别是暗孤子和气泡。我们发现,这样的解决方案可能,事实上,拥有一个合理的宽,实验相关的参数区间的稳定性,而他们也可能具有两个原型类型的不稳定性,即指数和振荡的,对于相同的配置。讨论了在解附近线性化的谱特性以及两个带和相关的微带隙的存在,并强调了与标准立方离散非线性薛定谔模型的非平凡差异。

英文摘要:

In the present work, we examine "binary" waveguide arrays, where the coupling between adjacent sites alternates between two distinct values $C_1$ and $C_2$ and a saturable nonlinearity is present on each site. Motivated by experimental investigations of this type of system in fabricated LiNbO$_3$ arrays, we proceed to analyze the nonlinear wave excitations arising in the self-defocusing nonlinear regime, examining, in particular, dark solitons and bubbles. We find that such solutions may, in fact, possess a reasonably wide, experimentally relevant parametric interval of stability, while they may also feature both prototypical types of instabilities, namely exponential and oscillatory ones, for the same configuration. The spectral properties of the linearization around the solutions and the presence of two bands and associated mini-gaps are discussed and the nontrivial differences from the standard cubic discrete nonlinear Schr{ö}dinger model are highlighted.

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