光诱导自聚焦类方晶格非格点激励一阶涡旋光演化  

Evolution of Off-Site First-Order Optical Vortices in Optically Induced Self-Focusing Square-Like Photonic Lattices

作　　者：覃亚丽[1] 杨斌[1] 余文愫 薛林林[1] 施朝霞[1] 任宏亮[1] 

机构地区：[1]浙江工业大学信息工程学院光纤通信与信息工程研究所,浙江杭州310023

出　　处：《激光与光电子学进展》2016年第7期222-229,共8页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(61275124;61405178;61306090)

摘　　要：光诱导光子晶格是一种周期光学系统,其对光束传输的控制在全光交换、光开关等方面具有潜在应用。运用优化的交替隐式差分波传输法对非线性薛定谔方程进行数值仿真,研究了涡旋光束在光诱导自聚焦类方晶格中的传播特性、光子晶格对光束传输的影响以及形成涡旋孤子的条件。研究发现,不存在晶格时,涡旋光束会由于自聚焦效应而分裂成基态孤子;存在晶格时,离散涡旋孤子的稳定传输与外加电场、晶格深度、输入光强有关,非格点激励的一阶涡旋光束在合适的条件下能形成稳定传输的离散涡旋孤子。Optically induced photonic lattices are periodic optical structures that can control the beam propagation, which has potential applications in all optical exchange and optical switch etc. An optimized alternative implicit differential wave propagation method is adopted to numerically simulate the nonlinear Schrodinger equation. The propagation characteristics of a vortex beam in optically induced self-focusing square-like lattices, the influence of the lattices on the beam propagation, and the conditions under which vortex solitons are formed are studied. The results show that the vortices will decay into the fundamental solitons due to self-focusing when there is no lattice. When the lattice exists, the stable propagation of the discrete vortex solitons is related to the applied electric field, the lattice depth and the input light intensity. Off-site single charged first order vortices can form discrete vortex solitons that propagate stably under appropriate conditions.

关 键 词：非线性光学 涡旋孤子 光子晶格 光折变效应 非线性薛定谔方程 

分 类 号：O436[机械工程—光学工程]