Colloidal hydrodynamic coupling in concentric optical vortices

Details Colloidal hydrodynamic coupling in concentric optical vortices Colloidal hydrodynamic coupling in concentric optical vortices

2005-03-17

arxiv.org/abs/cond-mat/0503431v1

Physics

Condensed Matter

Soft Condensed Matter

7 pages, 2 figures, submitted to Europhysics Letters

Scientific paper

Optical vortex traps created from helical modes of light can drive fluid-borne colloidal particles in circular trajectories. Concentric circulating rings of particles formed by coaxial optical vortices form a microscopic Couette cell, in which the amount of hydrodynamic drag experienced by the spheres depends on the relative sense of the rings' circulation. Tracking the particles' motions makes possible measurements of the hydrodynamic coupling between the circular particle trains and addresses recently proposed hydrodynamic instabilities for collective colloidal motions on optical vortices.

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