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Opt Lett. 2006 Oct 1;31(19):2824-6.

Reverse orbiting of microparticles in optical vortices.

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  • 1Division for Biomedical Physics, Innsbruck Medical University, Innsbruck, Austria.


We report the observation of particles trapped at an air-water surface orbiting in a reverse direction with respect to the orbital angular momentum of the light field. The effect is explained by a combination of asymmetric particle shape and confinement of the particle on the 2D air-water interface. The experiment highlights the strong influence of the particle shape on the momentum transfer, an effect that is often not considered in optical trapping experiments.

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