Mainz 2026 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 55: Optomechanics

Q 55.2: Vortrag

Donnerstag, 5. März 2026, 14:45–15:00, P 2

Dissipation dilution in 3D direct laser written mechanical resonators — •Daniel Stachanow¹, Lukas Tenbrake¹, Florian Giefer¹, Wolfgang Alt¹, Sebastian Hofferberth¹, and Hannes Pfeifer² — ¹Institute of Applied Physics, University of Bonn, Germany — ²Department of Microtechnology and Nanoscience, Chalmers University of Technology, Gothenburg, Sweden

Optomechanical platforms with high-quality mechanical and optical resonators have a wide application potential ranging from sensing to long-lived storage of quantum information. Recent developments in polymer-based 3D direct laser written structures allow for new paradigms in manufacturing micromechanical resonators due to their flexible geometries, but so far suffer from strong mechanical dissipation. Here, we present our recent progress in implementing and improving this platform. The mechanical Q-factor of the resonator in vacuum is primarily limited by intrinsic losses within the material. However, these losses can be significantly reduced by introducing strain on the membrane, leading to so-called dissipation dilution. This is done by engineering the geometry of the resonator for optimized aspect ratios and adjusting the fabrication process. To quantify the results, a scannable vacuum-integrated fiber cavity setup for probing mechanical resonators is used. We demonstrate the impact of shrinkage-induced strain on the mechanical Q-factor of polymeric bridge-like resonators. Additionally, we report the status of our current developments using post-fabrication treatment of applying oxygen-plasma to further optimize the surface properties and aspect ratios of the structures.

Keywords: Optomechanics; Fiber Cavity; Nanoscribe; Direct laser Writing; Dissipation Dilution