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

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【Author】 Ran Ling-Ling a)b),Guo Zhong-Yi b)c),and Qu Shi-Liang b) a) College of Electronic Engineering,Heilongjiang University,Harbin 150080,China b) Department of Optoelectronic Science,Harbin Institute of Technology at Weihai,Weihai 264209,China c) School of Computer and Information,Hefei University of Technology,Hefei 230009,China

【机构】 College of Electronic Engineering,Heilongjiang University； Department of Optoelectronic Science,Harbin Institute of Technology at Weihai； School of Computer and Information,Hefei University of Technology；

【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.更多还原

【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.更多还原

【关键词】 vortex femtosecond laser； rotation； particles；
【Key words】 vortex femtosecond laser； rotation； particles；

【基金】 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);the Science and Technology Programs of Heilongjiang Educational Committee,China (Grant No. 12511425)

【文献出处】 Chinese Physics B ,中国物理B , 编辑部邮箱 ,2012年10期

【分类号】TN24;O439
【被引频次】3
【下载频次】48

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