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

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

冉玲苓a b, 郭忠义b c, 曲士良b   

  1. 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
  • 收稿日期:2012-02-07 修回日期:2012-04-11 出版日期:2012-09-01 发布日期:2012-09-01
  • 基金资助:
    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).

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

Ran Ling-Ling (冉玲苓)a b, Guo Zhong-Yi (郭忠义)b c, Qu Shi-Liang (曲士良)b   

  1. 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
  • Received:2012-02-07 Revised:2012-04-11 Online:2012-09-01 Published:2012-09-01
  • Contact: Ran Ling-Ling, Qu Shi-Liang E-mail:ranlingling221@126.com; slqu1@yahoo.com.cn
  • Supported by:
    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).

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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.

关键词: vortex femtosecond laser, rotation, particles

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.

Key words: vortex femtosecond laser, rotation, particles

中图分类号:  (Mechanical effects of light on material media, microstructures and particles)

  • 42.50.Wk
42.40.Jv (Computer-generated holograms)