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Related Experiment Video

Updated: Feb 3, 2026

Simple Lithography-Free Single Cell Micropatterning using Laser-Cut Stencils

Simple Lithography-Free Single Cell Micropatterning using Laser-Cut Stencils

Published on: April 3, 2020

Engineering bacterial vortex lattice via direct laser lithography.

Daiki Nishiguchi^1,2,3, Igor S Aranson⁴, Alexey Snezhko⁵

¹Pathogenesis of Vascular Infections Unit, Institut Pasteur, 75015, Paris, France.

Nature Communications

|October 28, 2018

Summary

This summary is machine-generated.

Swimming bacteria suspensions, a form of active matter, self-organize into ordered patterns within pillar arrays. This study reveals how geometric confinement and chiral pillars control bacterial collective motion and emergent magnetic order.

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Area of Science:

Physics of active matter
Soft condensed matter physics
Microbiology

Background:

Active matter systems, like swimming bacteria, convert energy into motion.
Bacterial collective swimming can exhibit turbulent-like behavior.
Geometric confinement can organize chaotic active matter dynamics.

Purpose of the Study:

To investigate the self-organization of Bacillus subtilis suspensions in 2D periodic pillar arrays.
To explore the control of emergent collective motion and order in active matter.
To demonstrate manipulation of magnetic order in bacterial suspensions.

Main Methods:

Utilizing concentrated suspensions of motile Bacillus subtilis.
Employing 2D periodic arrays of microscopic vertical pillars for confinement.
Analyzing emergent vortex lattices and magnetic ordering through observation.

Main Results:

Bacteria self-organized into a lattice of hydrodynamically bound vortices.
A long-range antiferromagnetic order was observed, controlled by pillar spacing.
Optimal order was achieved when pillar spacing matched intrinsic vortex size.
Chiral pillars enabled manipulation from antiferromagnetic to ferromagnetic states.

Conclusions:

Periodic pillar arrays can rectify chaotic bacterial swimming into ordered vortex lattices.
Pillar spacing is a key parameter for controlling emergent magnetic order in active matter.
Chiral pillar design offers a strategy for actively controlling active 2D systems.