Near-Field Optical Trap by Tapered Fibre Probe
We propose a new method for optical trap in this paper. It is based on a tapered fibre probe with a tip size less than a light wavelength. A three-dimension gradient optical field is formed within the optical near field of the fibre probe, and a particle approaching the fibre tip will be trapped. We calculate the evanescent electromagnetic field near the fibre tip and obtain the trapping force for a dielectric particle. The calculating results show the availability of this method.
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