Theoretical study of the trapping efficiency of an optical tweezers array system
Li Qina, Hu Xiao-Minga, Cao Quna, Feng Wan-Lib, Sha Ding-Guob, Lin Jia-Mingb
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.
Received: 11 May 2007
Revised: 23 August 2007
Published: 20 February 2008
(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, Hu Xiao-Ming, Cao Qun, Feng Wan-Li, Sha Ding-Guo, Lin Jia-Ming Theoretical study of the trapping efficiency of an optical tweezers array system 2008 Chin. Phys. B 17 726
