Trapping capability of circular swallowtail beams
Huanpeng Liang, Xiaofang Lu, Kaijian Chen, Haixia Wu, Nana Liu, Tan Liu, Shao-Zhou Jiang, Yi Liang
Abstract
Circular swallowtail beams (CSBs) with their remarkable autofocusing capability have garnered significant interest due to their potential applications in optical trapping. This study delves into a comprehensive investigation of the trapping force properties of CSBs. Through a combination of experimental observations and theoretical analyses, we systematically explore the quantitative manipulation of trapping forces by adjusting specific parameters. This detailed investigation provides insights into the trapping force performance and stability of CSBs. In detail, our findings reveal a consistent extension of the focal length as scale factor increases, accompanied by a reduction in the focal peak intensity, intensity contrast, and largest trapping force. Notably, the alteration in trapping force exhibits greater sensitivity compared to that of intensity and intensity contrast. Furthermore, the experimental validation of particle trapping using CSBs underscores their effectiveness, emphasizing their significant potential for optical manipulation and trapping applications.