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Numerical analysis of near-field optical trapping using tapered fiber probe

A new scheme for optical trapping is presented in this paper. The method is based on a tapered filter probe with a tip diameter less than a light wavelength. A three-dimension gradient optical field is formed within the optical near field of the filter probe, and a particle approaching the fiber probe tip will be trapped. The evanescent eletromagnetic field in the vicinity of the fiber tip is calculated by the multiple multipole method (MMP). The intensity distributions and the trapping potentioal of the near fields of the tip versus the longitudinal and transverse distances from the tip are analyzed respectively. The trapping force is obtained for a dielectric particle. The numerical calculating results show the availability of this method.