The interaction of the light carrying orbital angular momentum (OAM) with a single spherical particle is explored using a commercial multi-physics simulation platform. The scattering of light with wavelength of 0.532 µm from an ice particle is presented. The research focuses on studying the light-matter interface within an observation volume of radius 10 times the wavelength (5.32 µm) and present near-field magnitude and phase of the scattered field. We place the particle at the various locations of a Gaussian beam, as well as move it to through the vortex and annulus of the light that carries OAM with topological charges of 1, 2 and 3. The numerical solutions showcase the variations of the scattering field complex values and provide a valuable insight in the field behaviour near and inside the particle for different illumination. We show two and three-dimensional scattering field magnitude and phase spatial distributions and their correlations.

中文翻译：

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携带粒子轨道角动量散射的激光束：近场强度和相位数值研究


使用商业多物理场仿真平台探索了携带光的轨道角动量 （OAM） 与单个球形粒子的相互作用。给出了冰粒波长为 0.532 μm 的光的散射。该研究的重点是研究半径为 10 倍波长 （5.32 μm） 的观测体积内的光-物质界面，并呈现散射场的近场星等和相位。我们将粒子放置在高斯光束的不同位置，并将其移动到携带 OAM 的光的漩涡和环形，拓扑电荷为 1、2 和 3。数值解展示了散射场复数值的变化，并为不同照明下粒子附近和内部的场行为提供了有价值的见解。我们展示了二维和三维散射场大小和相位空间分布及其相关性。