Dresden 2026 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 38: Active Matter VI (joint session DY/BP)
BP 38.3: Vortrag
Freitag, 13. März 2026, 10:15–10:30, ZEU/0160
Rotating Active 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 a Janus particle that spontaneously rotates in an optical tweezer, we aim to understand the main physical phenomena driving its dynamics. We compare experimental results with overdamped simulations where the optical tweezer is modelled with ray-optics in order to identify how thermophoretic self-propulsion and optical effects contribute differently to this behaviour.
Keywords: Janus particles; Optical tweezers; Theory; Computer simulations