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Q: Fachverband Quantenoptik und Photonik

Q 42: Poster: Quantum Optics and Photonics III

Q 42.45: Poster

Mittwoch, 2. März 2016, 16:30–19:00, Empore Lichthof

Optomechanical damping of nanomembranes in ring cavities — Simon Schuster, •Sebastian Slama, Arzu Yilmaz und Claus Zimmermann — Eberhard-Karls Universität Tübingen, Phys. Institut, Auf der Morgenstelle 14, 72076 Tübingen

We report on the observation of the optomechnical damping of an oscillating silicon nitride nanomembrane inside an optical ring cavity. The underlying damping mechanism is different from the typical situation achieved in linear cavities, where the cavity resonance frequency depends on the membrane position. This is not the case in a ring cavity, where the damping is solely caused by the fact that the electric fields in the cavity follow the membrane motion not instantaneously, but with the timescale of the cavity decay time. We quantify the different contributions of radiation pressure force, dipole force and bolometric forces, including the action of a second reflector in the cavity. In our setup this second reflector describes back-reflection from imperfections at the mirror surfaces. However, it may also represent a second membrane in the cavity, which makes this system a future playground for studying sychronization effects.