Evolutions of optical vortices under wide Gaussian background

• Main Authors: Guo Liang, Bingli Yuan, Yuan Li, Xiangwei Kong, Wenjing Cheng, Hongzhen Qiao, Xubo Hu
• Format: Article
• Language: English
• Published: Elsevier 2021-07-01
• Series: Results in Physics
• Subjects: Orbital angular momentum; Optical vortices; Optical tweezers
• Online Access: http://www.sciencedirect.com/science/article/pii/S2211379721004782

Analytically discussed is the evolution properties of optical vortices superimposed by Gaussian backgrounds. A kind of Tornado-like pattern is obtained after linear propagations, when the Gaussian background is wide enough compared with optical vortices. The same structures are exhibited by the intensity and the phase for the Tornado-like pattern, and the latter can be regarded as a clockwise rotation of the former. The gradient force exerted by the Tornado-like pattern upon micro-particles is investigated from the application point of view in optical tweezers. Compared to conventional optical vortices, the Tornado-like pattern shows the superior performance on the trapping ability for microparticles.