A new category of optical orbital angular momentum (OAM) associated with intensity singularity independent of phase singularity is predicted, and a kind of structured vortex beams (VBs) with arbitrary transverse shapes is demonstrated. A universal inverse‐designed caustic scheme is developed for generating such structured VBs which exhibit crucial intensity gradient and phase gradient. Additionally, they exhibit nonuniformly distributed phase gradients, capable of driving particles accelerately along a desired trajectory. Particle trapping experiments validate that such structured VBs without phase singularity drive the trapped particles to move along predefined trajectories. The idea not only provides an approach for generating and manipulating OAM from intensity singularity, enabling to spur further independent insights into the generation of OAM, but also paves the way for optically driving and accelerating particles along a desired trajectory.

中文翻译：

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强度奇异性诱导的结构性涡旋光束的轨道角动量


预测了一类与强度奇异性相关的新光学轨道角动量 （OAM），该文中介绍了一种具有任意横向形状的结构化涡旋光束 （VBs）。开发了一种通用的逆向设计焦散方案，用于生成这种表现出关键强度梯度和相位梯度的结构化 VB。此外，它们表现出不均匀分布的相位梯度，能够沿所需轨迹加速驱动粒子。粒子捕获实验验证了这种没有相位奇异性的结构化 VB 驱动被捕获的粒子沿着预定义的轨迹移动。这个想法不仅提供了一种从强度奇点生成和操纵 OAM 的方法，从而能够进一步独立地了解 OAM 的生成，而且还为沿所需轨迹光学驱动和加速粒子铺平了道路。