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

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...

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Bibliographic Details
Published in:Chinese physics B 2012-10, Vol.21 (10), p.279-282
Main Author: 冉玲苓 郭忠义 曲士良
Format: Article
Language:English
Subjects:
Angular momentum
Electron beams
Femtosecond
Fluid flow
Laser beams
Rotating
Rotational
Vortices
微观粒子
旋转运动
涡流
激光束
相位奇点
轨道角动量
飞秒激光
黑色颗粒
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Summary: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.
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/21/10/104206