›› 2008, Vol. 27 ›› Issue (3): 14-14.
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Abstract: From the gradient force upon an electric dipole in non-uniform electromagnetic field, the magnitude of the optical gradient force on a dielectric microsphere in light field is proportional to the field gradience and the principle of a single beam gradient laser trapping a dielectric microsphere are derived.
Key words: electric dipole, gradient force, optical trapping
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