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Q: Fachverband Quantenoptik und Photonik

Q 23: Poster I

Q 23.19: Poster

Dienstag, 12. März 2024, 17:00–19:00, Tent B

A vacuum-integrated fiber cavity setup for characterizing Q-optimized polymer-based mechanical resonators — •Florian Giefer, Daniel Stachanow, Lukas Tenbrake, Sebastian Hofferberth, and Hannes Pfeifer — Institute of Applied Physics, University of Bonn, Germany

Optomechanical platforms with high-quality mechanical and optical resonators have a wide application potential ranging from quantum limited sensing to long-lived storage of quantum information. Whilst exceptionally high quality factors have been realized with structures in thin layers of dielectric or semiconducting materials, their geometries are limited by the capacity of lithographic fabrication. Recent developments in polymer-based 3D direct laser-written structures allow for new paradigms in manufacturing micromechanical resonators, but so far suffer from strong mechanical dissipation. We show viable routes for improving this platform, including dissipation dilution, and present a scanable vacuum-integrated fiber cavity setup for probing high quality-factor mechanical resonators. To interface resonators we build a platform for flexible cavity construction between a fiber mirror and a DBR substrate in vacuum. Compared to previous designs, we improved the locking quality and flexibility of the optical cavity and added several additional features. Using this tool, optimized mechanical resonators and multi-resonator structures will be investigated in the near future.

Keywords: Fiber Cavity; Direct Laser Writing; Dissipation Dilution; Fabry-Perot; Nanoscribe