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Chin. Phys. B, 2008, Vol. 17(2): 726-735    DOI: 10.1088/1674-1056/17/2/061

Theoretical study of the trapping efficiency of an optical tweezers array system

Li Qin(李勤)a)† , Feng Wan-Li(冯万力)b), Hu Xiao-Ming(胡晓明)a), Cao Qun(曹群)a), Sha Ding-Guo(沙定国)b), and Lin Jia-Ming(林家明)b)
a Department of Biomedical Engineering, Beijing Institute of Technology, Beijing 100081, China; b Department of Opto-electronic Engineering, Beijing Institute of Technology, Beijing 100081, China
Abstract  Optical tweezers have been a valuable research tool since their invention in the 1980s. One of the most important developments in optical tweezers in recent years is the creation of two-dimensional arrays of optical traps. In this paper, a method based on interference is discussed to form gradient laser fields, which may cause the spatial modulation of particle concentration. The parameters related to the optical tweezers array are discussed in detail and simulated by the Matlab software to show the influence of important parameters on the distribution of particle concentration. The spatial redistribution of particles in a laser interference field can also be predicted according to the theoretical analysis.
Keywords:  optical tweezers array      gradient force      trapping efficiency      spatial modulation  
Received:  11 May 2007      Revised:  23 August 2007      Accepted manuscript online: 
PACS:  37.10.De (Atom cooling methods)  
  37.10.Mn (Slowing and cooling of molecules)  
  37.10.Vz (Mechanical effects of light on atoms, molecules, and ions)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No 20505002), the Excellent Young Scholars Research Fund of Beijing Institute of Technology (Grant No 000Y06-23), and the Excellent Scholars Research Fund of Beijing (Grant No 20071D1600300394).

Cite this article: 

Li Qin(李勤), Feng Wan-Li(冯万力), Hu Xiao-Ming(胡晓明), Cao Qun(曹群), Sha Ding-Guo(沙定国), and Lin Jia-Ming(林家明) Theoretical study of the trapping efficiency of an optical tweezers array system 2008 Chin. Phys. B 17 726

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