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Three tailorable optical vortices generated by a modified fractal spiral forked plate
Journal of Optics ( IF 2.1 ) Pub Date : 2021-03-23 , DOI: 10.1088/2040-8986/abe7c6
Tian Xia 1, 2, 3 , Shubo Cheng 4 , Weixing Yu 2 , Shaohua Tao 1, 5
Affiliation  

A modified fractal spiral forked plate (MFSFP) is proposed to generate three tailorable coplanar optical vortices at multiple focal planes, which consist of two off-axis vortices and one axial vortex. The axial vortex and one low-intensity off-axis vortex can have equal intensity by designing an appropriate spiral-like filter. In addition, the MFSFP has self-similar axial and off-axis optical vortices. Moreover, the tailorable topological charges of two off-axis vortices are related to those of the fractal spiral zone plate (FSZP) and forked grating and the topological charge of the axial vortex is equal to that of the FSZP. In the experiments, based on the interferometric measurement method, the differences between fingers of forked fingers are used to prove the above topological charge transformation rule. The method of constructing the MFSFP is illustrated. The MFSFP is applicable to rotate particles at multiple positions of the different planes simultaneously, increase optical communication capacities and produce multiple images simultaneously.



中文翻译:

由改进的分形螺旋叉板产生的三个可定制的光学涡流

提出了一种改进的分形螺旋叉板 (MFSFP),以在多个焦平面上生成三个可定制的共面光学涡流,其中包括两个离轴涡流和一个轴向涡流。通过设计合适的螺旋状过滤器,轴向涡流和一个低强度离轴涡流可以具有相等的强度。此外,MFSFP 具有自相似的轴向和离轴光学涡流。此外,两个离轴涡旋的可裁剪拓扑电荷与分形螺旋波带板(FSZP)和分叉光栅的拓扑电荷有关,轴向涡旋的拓扑电荷等于 FSZP 的拓扑电荷。实验中,基于干涉测量方法,利用分叉指之间的差异来证明上述拓扑电荷变换规则。说明了构建 MFSFP 的方法。MFSFP适用于在不同平面的多个位置同时旋转粒子,增加光通信能力,同时产生多幅图像。

更新日期:2021-03-23
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