Nematicons - Spatial Optical Solitons in Nematic Liquid Crystals
Nematicons - Spatial Optical Solitons in Nematic Liquid Crystals
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向列子 - 向列液晶中的空间光学孤子
DOI：
10.1002/9781118414637.ch7
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
García-Reimbert C
中科院分区：
文献类型：
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作者：
García-Reimbert C
在第三章中，我们已经描述了在向列型液晶中单个孤立波的模拟和演化的理论。在那一章中讨论的关键概念之一是介质的非定域响应。这种非局部响应意味着，由于光束对反射镜的扰动，会远远超出光束本身的束腰。虽然对于单个向列体来说是一个重要的效应，但它阻止了在局部二维光学孤立波情况下发生的灾难性崩溃[1]，但当研究多个向列体的相互作用时，它变得至关重要。双折射的非局域扰动意味着两束光可以通过双折射相互作用，即使它们看起来很好地分离。事实上，两个或多个线虫分子之间的相互作用将被发现与牛顿引力距离处的作用有密切联系[2]。研究线虫分子相互作用的主要动机是这种相互作用可以作为基于双折射液晶的全光路由和逻辑器件的基础[3-7]。基本概念是信号光束的轨迹可以通过控制光束或多个控制光束的存在而改变，从而导致信号光束被路由到给定的输出。这种控制是通过控制光束的相对物理位置及其功率来实现的。对线虫相互作用的详细了解，特别是它们之间的相互作用
The theory for modeling and evolution of a single solitary wave in a nematic liquid crystal, a nematicon, has been described in Chapter 3. One of the key concepts discussed in that chapter was that of the nonlocal response of the nematic medium. This nonlocal response means that the perturbation due to the optical beam on the nematic extends far beyond the waist of the optical beam itself. Although an important effect for a single nematicon, it stops the catastrophic collapse that occurs in the case of a local two-dimensional optical solitary wave [1], it becomes vital when the interaction of multiple nematicons is studied. The nonlocal perturbation of the nematic means that two optical beams can interact through the nematic even though they appear to be well separated. Indeed, the interaction between two or more nematicons will be found to have a close connection with the action at a distance of Newtonian gravitation [2].A primary motivation for the study of the interaction of nematicons is that this interaction can be used as the basis for all-optical routing and logic devices based on nematic liquid crystals [3–7]. The fundamental concept is that the trajectory of a signal beam can be altered by the presence of a control beam, or control beams, resulting in the signal beam being routed to a given output. This control is both through the relative physical positions of the control beams and their powers. The detailed understanding of the interaction of nematicons, particularly their interaction