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Change in collective motion of colloidal particles driven by an optical vortex with driving force and spatial confinement

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Abstract

We studied the change in collective behavior of optically driven colloidal particles on a circular path. The particles are simultaneously driven by the orbital angular momentum of an optical vortex beam generated by holographic optical tweezers. The driving force is controlled by the topological charge l of the vortex. By varying the driving force and spatial confinement, four characteristic collective motions were observed. The collective behavior results from the interplay between the optical interaction, hydrodynamic interaction and spatial confinement. Varying the topological charge of an optical vortex not only induces changes in driving force but also alters the stability of three-dimensional optical trapping. The switch between dynamic clustering and stable clustering was observed in this manner. Decreasing the cell thickness diminishes the velocity of the respective particles and increases the spatial confinement. A jamming-like characteristic collective motion appears when the thickness is small and the topological charge is large. In this regime, a ring of equally-spaced doublets was spontaneously formed in systems composed of an even number of particles.

Graphical abstract: Change in collective motion of colloidal particles driven by an optical vortex with driving force and spatial confinement

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Publication details

The article was received on 20 Mar 2018, accepted on 23 Jun 2018 and first published on 28 Jun 2018


Article type: Paper
DOI: 10.1039/C8SM00582F
Citation: Soft Matter, 2018, Advance Article
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    Change in collective motion of colloidal particles driven by an optical vortex with driving force and spatial confinement

    K. Saito, S. Okubo and Y. Kimura, Soft Matter, 2018, Advance Article , DOI: 10.1039/C8SM00582F

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