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Proceedings Paper

Dynamics of self-driven and flocking particles on periodic arrays
Author(s): J. Drocco; L. M. Lopatina; C. Reichhardt; C.J. Olson Reichhardt
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Paper Abstract

Recently there has been growing interest in what is called active matter, or collections of particles that are self driven rather than driven with an external field. Examples of such systems include swimming bacteria, flocks of birds or fish, and pedestrian flow. There have also been recent experimental realizations of self-driven systems using colloidal particles undergoing self-catalytic interactions. One example of this is light-induced catalysis where the colloids become self-driven in the presence of light. Almost all of these studies have been performed in the absence of a substrate. Here we examine how a substrate can be used to direct the motion of the particles. We demonstrate a self-induced ratchet effect that occurs in the presence of disorder as well as the direction of the particle along symmetry directions of the substrate. The type of substrate we consider may be created using various optical techniques, and studies of this system could lead to insights into the nonequilibrium behavior of active matter as well as to applications such as sorting of different active particle species or of active and non-active particles.

Paper Details

Date Published: 10 October 2012
PDF: 9 pages
Proc. SPIE 8458, Optical Trapping and Optical Micromanipulation IX, 84581I (10 October 2012); doi: 10.1117/12.931268
Show Author Affiliations
J. Drocco, Los Alamos National Lab. (United States)
L. M. Lopatina, Los Alamos National Lab. (United States)
C. Reichhardt, Los Alamos National Lab. (United States)
C.J. Olson Reichhardt, Los Alamos National Lab. (United States)

Published in SPIE Proceedings Vol. 8458:
Optical Trapping and Optical Micromanipulation IX
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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