Heidelberg 2015 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 62: Poster: Quantum Optics and Photonics III

Q 62.48: Poster

Thursday, March 26, 2015, 17:00–19:00, C/Foyer

Asymmetric fiber cavities for quantum opto-mechanics with SiN-membranes — •Philipp Christoph, Andreas Bick, Christina Staarmann, Hai Zhong, Alexander Schwarz, Roland Wiesendanger, Ortwin Hellmig, Jannes Heinze, Christoph Becker, and Klaus Sengstock — Zentrum für Optische Quantentechnologien, Universität Hamburg, Deutschland

We are currently setting up a quantum hybrid experiment, which aims at coupling a Bose-Einstein condensate to a cryogenically pre-cooled SiN membrane via long-range light interaction. A fiber cavity is used to enhance the coupling between light and membrane by a factor of the finesse. Asymmetric coating of the cavity mirrors enables finite on-resonance reflection required to establish a mutual resonant coupling between the BEC and the membrane motion. Our results reveal that the on-resonance reflectivity is extremely sensitive to the mode match between fiber- and cavity mode. Best mode match is achieved for plano-concave cavities. Using standard single mode fibers with mode field diameter of 5.2 µ m, we derive an optimal mode match for a radius of curvature close to 50 µ m and cavity length of L ≈ 25 µ m. In this way we achieve values for the on-resonance power reflection ideally suited for our envisaged quantum hybrid system.