Delre Eugenio, D'Ercole Angelo, Palange Elia
Dipartimento di Fisica, Università dell'Aquila, Italy.
Phys Rev E Stat Nonlin Soft Matter Phys. 2005 Mar;71(3 Pt 2B):036610. doi: 10.1103/PhysRevE.71.036610. Epub 2005 Mar 17.
We extend investigation of one-dimensional solitons in biased photorefractive crystals to long propagation regimes, where self-trapping over a large number of linear diffraction lengths combines with the progressive growth of generally distortive spatially nonlocal components. Results indicate that saturation halts the radiative misshaping of the soliton, which follows that specific bending trajectory along which its evolution is governed by the same local screening nonlinearity that intervenes in short propagation conditions, where spatial nonlocality has a negligible effect. This finding not only allows the prediction of the curvature and of the relative role of charge displacement and diffusion, but implies a set of interesting observable effects, such as boomerangs, counterpropagating and cavity geometries, quasirectilinear and anomalous collisions, along with specific consequences on soliton arrays and on coupling to bulk gratings.
我们将对有偏压光折变晶体中一维孤子的研究扩展到长传播区域，在该区域中，在大量线性衍射长度上的自陷与通常具有畸变作用的空间非局域分量的逐渐增长相结合。结果表明，饱和现象会阻止孤子的辐射畸变，孤子会沿着特定的弯曲轨迹演化，在该轨迹上，其演化由与在短传播条件下起作用的相同局部屏蔽非线性所支配，在短传播条件下空间非局域性的影响可忽略不计。这一发现不仅能够预测曲率以及电荷位移和扩散的相对作用，还意味着一系列有趣的可观测效应，例如回旋镖效应、反向传播和腔几何结构、准直线和异常碰撞，以及对孤子阵列和与体光栅耦合的特定影响。
