文章基本信息

标题：Hydrodynamic synchronization of colloidal oscillators
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作者：Jurij Kotar ; Marco Leoni ; Bruno Bassetti 等
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2010
卷号：107
期号：17
页码：7669-7673
DOI：10.1073/pnas.0912455107
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：Two colloidal spheres are maintained in oscillation by switching the position of an optical trap when a sphere reaches a limit position, leading to oscillations that are bounded in amplitude but free in phase and period. The interaction between the oscillators is only through the hydrodynamic flow induced by their motion. We prove that in the absence of stochastic noise the antiphase dynamical state is stable, and we show how the period depends on coupling strength. Both features are observed experimentally. As the natural frequencies of the oscillators are made progressively different, the coordination is quickly lost. These results help one to understand the origin of hydrodynamic synchronization and how the dynamics can be tuned. Cilia and flagella are biological systems coupled hydrodynamically, exhibiting dramatic collective motions. We propose that weakly correlated phase fluctuations, with one of the oscillators typically precessing the other, are characteristic of hydrodynamically coupled systems in the presence of thermal noise.
关键词：colloidal particles ; hydrodynamic interaction ; metachronal wave ; optical tweezers ; nonlinear dynamical system