Rotational motions of optically trapped microscopic particles by a vortex femtosecond laser

doi:10.1088/1674-1056/21/10/104206

Abstract 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.

Keywords: vortex femtosecond laser rotation particles

Received: 07 February 2012
Revised: 11 April 2012
Accepted manuscript online:

PACS:	42.50.Wk	(Mechanical effects of light on material media, microstructures and particles)
	42.40.Jv	(Computer-generated holograms)
	42.40My

Fund: Project supported by the National Natural Science Foundation for Post-Doctoral Scientists of China (Grant No. 2012M511002), the National Natural Science Foundation of China (Grant Nos. 10904027 and 61108018), and the Science and Technology Programs of Heilongjiang Educational Committee, China (Grant No. 12511425).

Corresponding Authors: Ran Ling-Ling, Qu Shi-Liang
E-mail: ranlingling221@126.com; slqu1@yahoo.com.cn

Cite this article:

Ran Ling-Ling (冉玲苓), Guo Zhong-Yi (郭忠义), Qu Shi-Liang (曲士良) Rotational motions of optically trapped microscopic particles by a vortex femtosecond laser 2012 Chin. Phys. B 21 104206

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Rotational motions of optically trapped microscopic particles by a vortex femtosecond laser

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