Bonn 2025 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 12: Quantum Optomechanics I
Q 12.2: Vortrag
Montag, 10. März 2025, 17:15–17:30, HS I
Inverse numerical design of optically levitated nanoparticles for enhanced stiffness and detection efficiency — •Moosung Lee1,2 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
Levitated optomechanics offers a promising avenue for achieving quantum-limited motional control of massive objects. To enable precision sensing and quantum mechanical tests on larger mass scales, it is essential to scale particle sizes beyond the Rayleigh regime, where the particle diameter is far smaller than the wavelength of optical tweezers. However, the multiple light scattering in larger particles hamper efficient optical trapping and motional detection, limiting quantum-limited applications beyond the nanoparticle scale in levitodynamics. Here, we propose an optimization algorithm based on the adjoint state method to inversely design three-dimensional shapes of optically levitated microparticles suitable for quantum optomechanical experiments. Using this approach, we numerically optimize the structures of silica and silicon particles in a standing-wave optical trap. Preliminary results demonstrate a mass enhancement, while maintaining 3D trap frequencies and detection efficiency comparable to those of Rayleigh nanoparticles. These parameters support the feasibility of achieving 3D quantum-ground-state motional cooling of the shape-optimized microparticles.
Keywords: Levitodynamics; Inverse design; Optical tweezers; Optomechanics