Bonn 2025 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 21: Quantum Optomechanics II
Q 21.1: Talk
Tuesday, March 11, 2025, 11:00–11:15, HS I
Numerical modelling of particle behaviours in optical tweezers outside paraxial approximation — •Tobias Hanke1,2, Moosung Lee1,2, Sara Launer1,2, and Sungkun Hong1,2 — 1Institute for Functional Matter and Quantum Technologies, University of Stuttgart, 70569 Stuttgart, Germany; — 2Center for Integrated Quantum Science and Technology, University of Stuttgart, 70569 Stuttgart, Germany;
Optically levitated nanoparticles have gained interest as valuable platforms for various applications in precision sensing and quantum-limited experiments. Accurately predicting the dynamics of an optically trapped nanoparticle is crucial for understanding the system. However, conventional methods of modelling the optical tweezers light rely on paraxial approximations, hindering precise characterization of dynamics. Here, we present a numerical modelling method of an optical tweezer field for predicting the dynamics of an optically trapped nanoparticle. Compared to the conventional paraxial approximation, we experimentally show that our numerical model based on the vectorial angular spectrum method demonstrates better prediction of three-dimensional trapping frequencies of optically trapped silica nanoparticles. Using our model, we also provide the predicted trap parameters relevant for future optomechanical applications, including the scattering power and the recoil heating rate.
Keywords: Optical tweezers; Optomechanics; Microscopy; Levitodynamics; Angular Spectrum Method