论文标题
半分化涡流孤子
Semidiscrete vortex solitons
论文作者
论文摘要
我们证明了创建稳定的光学孤子的可能性,将一个连续的和一个离散的坐标与嵌入式涡度结合在一起,并在具有内在的立方Quintic非线性的一系列平面波导中。可以通过与立方骨折的隧道耦合光纤阵列中的时空光传播来实现相同的系统。与零涡度状态相反,没有非线性中的五重奏项,半分化涡流孤子就不存在。 \ emph {viz。}的两种类型的类型,分别为中心和现场的,分别是IC和OC,均匀且奇数$ n $在离散方向上实际兴奋的站点的$ n $。我们考虑携带嵌入式涡度$ s = 1 $和$ 2 $的模式。根据它们的对称性,OC类型的涡旋孤子具有内在的核心,而具有较小$ n $的IC孤子可能具有无凝结结构。在实验中促进他们的创建,本工作中报道的模式可能比其他系统中考虑的同行更紧凑,并且具有强烈的各向异性。只要耦合常数超过一定的最小值,就可以在离散方向上进行运动。也考虑了移动涡流孤子之间的碰撞。
We demonstrate a possibility of the creation of stable optical solitons combining one continuous and one discrete coordinate, with embedded vorticity, in an array of planar waveguides with intrinsic cubic-quintic nonlinearity. The same system may be realized in terms of the spatiotemporal light propagation in an array of tunnel-coupled optical fibers with the cubic-quintic nonlinearity. In contrast with zero-vorticity states, semidiscrete vortex solitons do not exist without the quintic term in the nonlinearity. Two types of the solitons, \emph{viz.}, intersite- and onsite-centered ones (IC and OC, respectively), with even and odd numbers $N$ of actually excited sites in the discrete direction, are identified. We consider the modes carrying the embedded vorticity $S=1$ and $2$. In accordance with their symmetry, the vortex solitons of the OC type exhibit an intrinsic core, while the IC solitons with a small $N$ may have a coreless structure. Facilitating their creation in the experiment, the modes reported in the present work may be much more compact states than their counterparts considered in other systems, and they feature strong anisotropy. They can be set in motion in the discrete direction, provided that the coupling constant exceeds a certain minimum value. Collisions between moving vortex solitons are considered too.