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DY: Fachverband Dynamik und Statistische Physik
DY 62: Active Matter VI (joint session DY/BP)
DY 62.3: Vortrag
Freitag, 13. März 2026, 10:15–10:30, ZEU/0160
Interactions between Janus particles in optical tweezers — •Arnaud Compagnie1, Abhimanyu Nowbagh2, Ivo Buttinoni2, and Hartmut Löwen1 — 1Institute for Theoretical Physics II, Heinrich Heine University Düsseldorf, 40225 Düsseldorf, Germany — 2Institute for Experimental Physics of Condensed Matter, Heinrich Heine University Düsseldorf, 40225 Düsseldorf, Germany
Janus particles, by using their asymmetric properties to self-propel due to phoretic effects, are the most prominent artificial active colloids at the microscale. Their ability to extract energy from their surroundings and to self-assemble are used to perform specific tasks. However, due to the vast amount of types of Janus particles and the complex systems they evolve in, the way they interact with their environment remains poorly understood. Optical tweezers can be used to trap them and control their behaviour. By studying how a trapped Janus particle affects the movements of another one in a separate trap, we aim to identify the main physical phenomena - optics, hydrodynamic fluxes, and phoretic fields - that influence the interactions between them. We establish and simulate physical models in order to derive the characteristic dynamical properties of the Janus particles thanks to the comparison with experimental data.
Keywords: Janus particles; Optical tweezers; Interactions between active colloids; Theory; Computer simulations