Optically trapping Rayleigh particles by using focused partially coherent multi-rotating elliptical Gaussian beams

Xi Peng, Chidao Chen, Bo Chen, Yulian Peng, Meiling Zhou, Xiangbo Yang, and Dongmei Deng

By investigating the cross-spectral density of partially coherent multi-rotating elliptical Gaussian beams (REGBs) that propagate through a focusing optical system, we obtain the radiation force on a Rayleigh particle. The radiation force distribution is studied under different beam indexes, coherence widths, and elliptical ratios of the partially coherent multi REGBs. The transverse and the longitudinal trapping ranges can increase at the focal plane by increasing the beam index or decreasing the coherence width. The range of the trapped particle radii increases as the elliptical ratio increases. Furthermore, we analyze the trapping stability.

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