Acta Photonica Sinica, Volume. 42, Issue 11, 1300(2013)
Comparative Analysis of the Trapping Force Using LaguerreGaussian Beam and Gaussian Beam
The axial trapping effect of hollow beam such as LaguerreGaussian beam is better than that of Gaussian beam. The intensity distributions of Gaussian beam and LaguerreGaussian beam were simulated according to their crosssection intensity expression. The trapping Qfactors of Gaussian beam and LaguerreGaussian beam were calculated in the rayoptics model. The trapping efficiencies of Gaussian beam and LaguerreGaussian beam were compared with different trappped bead size and refractive index, numerical aperture of microscope objective, and the distance from the bottom of the sample cell to the trapped bead. The results show that the maxmium backward trapping Qfactor and trap stiffness of LaguerreGaussian beam are higher than those of the Gaussian beam. LaguerreGaussian beam is more sensitive to spherical aberration due to its special intensity distribution, especially when the numerical aperture of microscope objective is high.
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ZHOU Yepeng, REN Hongliang, WANG Juan, CHEN Ling. Comparative Analysis of the Trapping Force Using LaguerreGaussian Beam and Gaussian Beam[J]. Acta Photonica Sinica, 2013, 42(11): 1300
Received: Apr. 15, 2013
Accepted: --
Published Online: Dec. 16, 2013
The Author Email: Yepeng ZHOU (394757649@qq.com)