Measurement of the restoring forces acting on two optically bound particles from normal mode correlations

Nikolaus Klaus Metzger, Robert F Marchington, Michael Mazilu, R L Smith, Kishan Dholakia, Ewan M Wright

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Optical binding along the axis of two counterpropagating laser fields may be used to organize microparticles into longitudinal, spatially separated, arrays. Here we investigate correlations between the displacements of two optically bound microparticles from their equilibrium positions due to noise. Measurement of the decay time of the correlation functions of the center of mass and relative normal modes is shown to provide an in situ method to determine the optical restoring forces acting on the bound particles, thereby providing a test of our physical understanding of longitudinal optical binding.

Original languageEnglish
Article number068102
Number of pages4
JournalPhysical Review Letters
Issue number6
Publication statusPublished - 9 Feb 2007


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