中国物理B ›› 2012, Vol. 21 ›› Issue (10): 104206-104206.doi: 10.1088/1674-1056/21/10/104206
• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇 下一篇
冉玲苓a b, 郭忠义b c, 曲士良b
Ran Ling-Ling (冉玲苓)a b, Guo Zhong-Yi (郭忠义)b c, Qu Shi-Liang (曲士良)b
摘要: The rotational motions of the optically trapped microscopic particles by the vortex femtosecond laser beam are investigated in this paper. Black particles can be trapped and rotated by a vortex femtosecond laser beam very effectively because the vortex beam carries orbital angular momentum due to the helical wave-front structure in assoication with the central phase singularity. Trapped black particles rotate in the vortex beam due to the absorption of the angular momentum transferred from the vortex beam. The rotating directions of the trapped particles can be modulated by reversing the topological charge of the optical vortex in the vortex femtosecond beam. And the rotating speeds of the trapped microscopic particles greatly depend on the topological charges of the vortex tweezer and the used pulse energies.
中图分类号: (Mechanical effects of light on material media, microstructures and particles)