Movie shows the dynamics of the energy density distribution of the l = 1 optical vortex varying with time in the focus plane perpendicular to the optical axis. Authors study the optical trapping phenomena by using computer simulation to show a detailed account of the process of momentum exchange between a focused light and a microscopic particle in an optical trapping by use of the finite difference time domain method. [See article by Zhang et al. Fig. 6(c) for details.]
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