Realization of a motility-trap for active particles

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2020
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Jahanshahi, Soudeh
Liebchen, Benno
Löwen, Hartmut
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Communications Physics. Springer Nature. 2020, 3, 127. eISSN 2399-3650. Available under: doi: 10.1038/s42005-020-0393-4
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Trapping of atomic and mesoscopic particles with optical fields is a practical technique employed in many research disciplines. Developing similar trapping methods for self-propelled, i.e. active, particles is, however, challenging due to the typical anisotropic material composition of Janus-type active particles. This renders their trapping with magneto-optical fields to be difficult. Here we present the realization of a motility-trap for active particles, which only exploits their self-propulsion properties. By combining experiments, numerical simulations, and theory, we show that, under appropriate conditions, a force-free rotation of the self-propulsion direction towards the trap's center can be achieved, which results in an exponential localization of active particles. Because this trapping mechanism can be applied to any propulsion scheme, we expect such motility-tweezers to be relevant for fundamental studies of self-driven objects as well as for their applications as autonomous microrobots.

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ISO 690JAHANSHAHI, Soudeh, Celia LOZANO, Benno LIEBCHEN, Hartmut LÖWEN, Clemens BECHINGER, 2020. Realization of a motility-trap for active particles. In: Communications Physics. Springer Nature. 2020, 3, 127. eISSN 2399-3650. Available under: doi: 10.1038/s42005-020-0393-4
BibTex
@article{Jahanshahi2020-12Reali-50433,
  year={2020},
  doi={10.1038/s42005-020-0393-4},
  title={Realization of a motility-trap for active particles},
  volume={3},
  journal={Communications Physics},
  author={Jahanshahi, Soudeh and Lozano, Celia and Liebchen, Benno and Löwen, Hartmut and Bechinger, Clemens},
  note={Article Number: 127}
}
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