Guiding particles along arbitrary trajectories by circular Pearcey-like vortex beams
Danlin Xu, Zhenwu Mo, Junjie Jiang, Haoyu Huang, Quanfeng Wei, You Wu, Xinyue Wang, Zehong Liang, Haobin Yang, Hechong Chen, Haiqi Huang, Hongzhan Liu, Dongmei Deng, Lingling Shui
Abstract
A type of circular Pearcey-like vortex beam (CPLVB) is introduced numerically and experimentally, combining the properties of self-acceleration and abruptly autofocusing in the off-axis position. The interplay between the spiral phase and the modulated phase of arbitrary predesigned trajectories assists the beam to present a special shape which is suitable for manipulating and guiding particles along arbitrary trajectories. The beam propagating along the hyperbolic, hyperbolic secant trajectories generates a twisting hollow guide channel, and a parabolic bottlelike structure is constructed when the beam accelerates along the parabolic trajectory. Furthermore, the generation of the CPLVB, stable trapping, and rotation motion of micron-sized particles and transport of light-absorbing particles in air are realized in the experiment. Our results may bring about possibilities for wave front control, optical guidance, and manipulation of particles.