Optical forces on small particles from partially coherent light

Details Optical forces on small particles from partially coherent light Optical forces on small particles from partially coherent light

2012-01-29

arxiv.org/abs/1201.6004v1

Physics

Optics

Scientific paper

We put forward a theory on the optical force exerted upon a dipolar particle by a stationary and ergodic partially coherent light ?eld. We show through a rigorous analysis that the ensemble averaged electromagnetic force is given in terms of a partial gradient of the space variable diagonal elements of the coherence tensor. Further, by following this result we characterize the conservative and non-conservative components of this force. In addition, we establish the propagation law for the optical force in terms of the coherence function of light at a di?raction plane. This permits us to evaluate the e?ect of the degree of coherence on the force components by using the archetypical con?guration of Young's two apertures di?raction pattern, so often employed to characterize coherence of waves.

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