Colloidal hydrodynamic coupling in concentric optical vortices

Abstract

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.

7 pages, 2 figures, submitted to Europhysics Letters

References in corpus (4)

• Computer-Generated Holographic Optical Tweezer Arrays
• Microoptomechanical pumps assembled and driven by holographic optical vortex arrays
• Hydrodynamic Coupling of Two Brownian Spheres to a Planar Surface
• Circling particles and drafting in optical vortices

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• Acoustokinetics: Crafting force landscapes from sound waves
• Hydrodynamic spin-orbit coupling in asynchronous optically driven micro-rotors
• Hydrodynamic interactions hinder transport of flow-driven colloidal particles
• Particles held by springs in a linear shear flow exhibit oscillatory motion
• The rheology of confined colloidal hard discs