Abruptly autofocusing and trapping capability properties of circular Butterfly Pearcey beams

In this paper, the circular Butterfly Pearcey beams (CBPBs) with autofocusing properties are constructed for the first time, and its autofocusing and trapping capabilities are investigated theoretically and experimentally. We accomplish precise control over the number of focal points, the focal length, the focus intensity, and the main power ring position of CBPBs through the adjustment of the transverse scale factor, the spatial offset, and the second-order chirp factor. At the same time, we present a modulation method that significantly enhances beam focusing capability while maintaining the focal length. Additionally, we explore the magnitudes of the scattering force, gradient force, and trapping force exerted by both the CBPBs and the circular Pearcey beams (CPBs) on Rayleigh particles. The results indicate that the autofocusing ability and trapping force of CBPBs are twice as effective as those of CPBs. Finally, experiments verify the transmission properties of CBPBs and its trapping characteristics for one or two particles. The simulation results are in close accordance with the experimental findings. Therefore, the CBPBs offer an important option for a variety of applications in fields such as light trapping and particle manipulation.