近日，广西大学的梁毅课题组与电子科技大学的洪佩龙等人合作，成功实现了多艾里（multi-Airy）涡旋光束自动聚焦和捕获的定量表征，相关研究成果已于2023年4月5日在国际学术期刊《物理评论A》上发表。

该研究团队提出了一种名为多艾里涡旋光束（MAVBs）的自聚焦涡旋光束，并通过理论和实验对其自聚焦和捕获特性进行了研究。研究发现，通过调整相关参数和在一定范围内增加叠加的Airy的数量，可提高MAVBs的自聚焦性能和捕获能力。尽管MAVBs的捕获力和捕获刚度随拓扑电荷的增加而降低，但实验表明MAVBs在捕获和操纵大尺寸颗粒方面具有优势。在旋转多个颗粒的过程中，MAVBs的拓扑电荷越大，可同时旋转更多的颗粒。

此外，通过控制颗粒之间的分散程度，可以轻松调节旋转的速度和方向。该研究为定量探索自聚焦涡旋光束的光学捕获能力提供了指导，进而有可能开发出不同的光子工具，用于光学捕获和操纵。

研究人员表示，突然自聚焦涡旋光束被提出用于各种应用，如光学操纵，但它们的捕获能力的定量表征仍然很少被探索。

附：英文原文

Title: Quantitative characterization of autofocusing and trapping of multi-Airy vortex beams

Author: Liu Tan, Nana Liu, Fuxi Lu, Dongmei Liu, Beibei Yu, Yuting Li, Hao Wu, Kaijian Chen, Yizhe Chu, Peilong Hong, Yi Liang

Issue&Volume: 2023/04/05

Abstract: Abruptly autofocusing vortex beams were proposed for a variety of applications such as optical manipulation, but their quantitative characterization of their trapping capability remains largely unexplored. In this paper, we propose a type of autofocusing vortex beams named multi-Airy vortex beams (MAVBs) and investigate their autofocusing and trapping characteristics theoretically and experimentally. It is found that the autofocusing performance and trapping ability of MAVBs can be enhanced by adjusting the relevant parameters and increasing the number of superposed Airy within a certain range. Although the trapping force and trapping stiffness of MAVBs decrease as the topological charge increases, we found that MAVBs have advantages in capturing and manipulating large-sized particles in our experiments. In the process of manipulating multiple particles for rotation, the larger the topological charge, the more particles can be rotated simultaneously by MAVBs. Moreover, the speed and even the direction of rotation can be easily adjusted by controlling the degree of dispersion between particles. Our work provides a guide to quantitatively exploring the optical trapping capabilities of autofocusing vortex beams, which may lead to different photonic tools for optical trapping and manipulation.

DOI: 10.1103/PhysRevA.107.043501

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.107.043501