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Hydrodynamic synchronization of autonomously oscillating optically trapped particles.

Ivna Kavre¹, Andrej Vilfan², Dušan Babič¹

¹Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana, Slovenia.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|April 15, 2015

Summary

Micron-sized ellipsoidal particles synchronized oscillations via hydrodynamic interactions when trapped in laser beams. Synchronization depended on particle distance and orientation, offering insights into biological cilia synchronization.

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Area of Science:

Colloidal physics
Soft matter physics
Biophysics

Background:

Ellipsoidal colloidal particles exhibit spontaneous oscillations when confined in focused laser beams.
Hydrodynamic interactions mediate synchronization between nearby oscillating particles.

Purpose of the Study:

To investigate the synchronization of oscillating ellipsoidal particles.
To determine the influence of inter-particle distance and orientation on synchronization.
To establish a model system for studying hydrodynamic synchronization.

Main Methods:

Trapping micron-sized ellipsoidal particles in a focused laser beam.
Observing and analyzing particle oscillations and synchronization.
Developing a phenomenological model for optical forces and hydrodynamic interactions.

Main Results:

Synchronization of oscillations was observed between two or more particles.
Synchronization strength was dependent on particle separation and relative orientation.
Synchronization was maximal when particles aligned with their oscillation direction.
Experimental data were accurately reproduced by the phenomenological model.

Conclusions:

Hydrodynamic interactions drive synchronization in oscillating ellipsoidal particles.
Particle arrangement significantly impacts synchronization dynamics.
This system serves as a valuable model for understanding biological cilia synchronization.