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Modal description of paraxial structured light propagation: tutorial
Journal of the Optical Society of America A ( IF 1.9 ) Pub Date : 2021-09-16 , DOI: 10.1364/josaa.432431
Hend Sroor , Chane Moodley , Valeria Rodríguez-Fajardo , Qiwen Zhan , Andrew Forbes

Here we outline a description of paraxial light propagation from a modal perspective. By decomposing the initial transverse field into a spatial basis whose elements have known and analytical propagation characteristics, we are able to analytically propagate any desired field, making the calculation fast and easy. By selecting a basis other than that of planes waves, we overcome the problem of numerical artifacts in the angular spectrum approach and at the same time are able to offer an intuitive understanding for why certain classes of fields propagate as they do. We outline the concept theoretically, compare it to the numerical angular spectrum approach, and confirm its veracity experimentally using a range of instructive examples. We believe that this modal approach to propagating light will be a useful addition to the toolbox for propagating optical fields.

中文翻译:

近轴结构光传播的模态描述:教程

在这里,我们概述了从模态角度对近轴光传播的描述。通过将初始横向场分解成一个空间基,其元素具有已知的解析传播特性,我们能够解析传播任何所需的场,使计算变得快速而简单。通过选择平面波以外的基础,我们克服了角谱方法中数值伪影的问题,同时能够直观地理解为什么某些类别的场会像它们那样传播。我们从理论上概述了该概念,将其与数值角谱方法进行了比较,并使用一系列具有指导意义的示例通过实验确认了其准确性。
更新日期:2021-10-02
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