Regensburg 2025 – scientific programme
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BP: Fachverband Biologische Physik
BP 17: Poster Session II
BP 17.63: Poster
Tuesday, March 18, 2025, 18:00–20:30, P4
Trajectories of particles trapped in double well potentials show new behavior in the Mean Back Relaxation — •Christian Muñoz1, Mohammad A. Eskandari1, Bart E. Vos1, Till M. Münker1, Dorian Marx1, Matthias Krüger2, and Timo Betz1 — 1Third Institute of Physics - Biophysics, Georg August University Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany — 2Institute for Theoretical Physics, Georg August University Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
Optical tweezers have been established as a powerful tool for studying microscopic particle dynamics in complex potentials. In this work, we investigate the behavior of a microparticle trapped in a double-well potential generated by optical tweezers. By systematically varying the laser power and the distance between the optical traps, we modeled the shape and depth of the potential. This approach allowed for a detailed analysis of the particle's stochastic transitions between the wells. Combining experimental measurements with Kramers' theory, we achieved accurate predictions of the transition rates between wells. Furthermore, we analyzed particle trajectories using the new quantity of Mean Back Relaxation (MBR), providing insights into the effects that a bistable system has on particle relaxation after defined fluctuations.
Keywords: Optical tweezers; Kramers' theory; Bistability