寄居于非旁轴矢量光束的李萨如线的相互作用

Interaction of two singular Lissajous lines carried by non-paraxial vector beams

从理论和数值模拟两方面研究了寄居于非旁轴矢量光束的两条李萨如线的相互作用。研究发现:李萨如线因不稳定而在传输中消失,并有李萨如奇点出现。当传输距离、振幅因子、离轴距离和光束波长变化时,李萨如奇点的位置,偏振度和李萨如图形可能发生改变,还会发生成对李萨如奇点因带有相反拓扑电荷而接近和湮灭。研究结果对深入理解非旁轴多色矢量光束奇点光学和寻找奇点光学潜在应用具有一定参考价值。

The interaction of two singular Lissajous lines emergent from non-paraxial vector beam is studied.It is shown that singular Lissajous lines disappear with propagation,meanwhile,the Lissajous singularities take place.The changes in the shape of Lissajous figures,the degree of polarization and the position of Lissajous singularities,as well as the creation and the annihilation of single singularity may appear by varying control parameters.In addition,creation and annihilation of pairs of Lissajous singularities with opposite topological charges take place with propagation.The results would be useful for deeply understanding singular optics and seeking for their potential applications.