光学学报, 2009, 29 (2): 517, 网络出版: 2009-02-23
平面涡旋光干涉的分析 下载: 529次
Analysis of Interference of Planar Vortex Beams
物理光学 光学涡旋 涡旋光干涉 平面涡旋光 数值模拟 计算全息 physical optics optical vortex interference of vortex beams planar vortex beam numerical simulation computer-generated holography
摘要
光学涡旋具有独特的相位奇点和螺旋相位结构, 多个涡旋光场之间的干涉呈现出新颖的强度和相位分布特征。通过在平面波背景中嵌入涡旋相位产生平面涡旋光场, 采用数值模拟方法研究了多个平面涡旋光场之间的干涉, 并分析了两个平面涡旋光场的中心间距及拓扑荷值对涡旋产生和湮灭的影响。进一步数值研究了对称分布的多个点涡旋光之间的干涉, 结果表明通过改变涡旋光束数目或者拓扑荷值, 可获得不同分布的对称涡旋阵列光场。利用计算全息并通过空间光调制器, 实验上实现了具有不同拓扑荷值的多个对称点涡旋光场的干涉, 其干涉图样与模拟结果吻合。实验结果不仅证实了数值模拟结果, 也为实验研究复杂涡旋光场的干涉提供了一种有效方法。
Abstract
The interference of several optical vortices can generate intriguing intensity and phase distributions due to the particular helical phase structures and central singularities. The interference of optical planar vortex, which has a phase singularity and a dark hole nested in an infinite plane-wave background, is simulated. The influences of the distances between the singularities and the topological charges of two planar vortices on the annihilations and creations of vortices are analyzed, respectively. Further, the interference of the symmetric point vortices is investigated numerically. The results show that a rich variety of the symmetric vortex arrays can be obtained by changing the number of the vortices and/or the topological charges. The interference of the symmetric point vortices is demonstrated experimentally by utilizing computer-generated holography and spatial light modulator. The experimental results are in good agreement with those of numerical simulation. It not only confirms the numerical results, but also demonstrates a convenient way of generating interference of complex optical vortices.
王浩, 杨德兴, 甘雪涛, 赵建林, 任小元, 姜宏振. 平面涡旋光干涉的分析[J]. 光学学报, 2009, 29(2): 517. Wang Hao, Yang Dexing, Gan Xuetao, Zhao Jianlin, Ren Xiaoyuan, Jiang Hongzhen. Analysis of Interference of Planar Vortex Beams[J]. Acta Optica Sinica, 2009, 29(2): 517.