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Q: Fachverband Quantenoptik und Photonik

Q 28: Quanteninformation: Photonen III

Q 28.2: Vortrag

Dienstag, 3. März 2009, 16:45–17:00, VMP 6 HS-D

Towards coupling of a single emitter to a fiber based micro cavity — •Roland Albrecht¹, Benjamin Sauer¹, Christian Deutsch², Jakob Reichel², and Christoph Becher¹ — ¹Fachrichtung 7.3, (Technische Physik), Universität des Saarlandes, Campus E2.6, 66123 Saarbrücken — ²Laboratoire Kastler Brossel, ENS/UPMC-Paris 6/CNRS, 24 rue Lhomond, 75005 Paris, France

Coupling a single emitter to a micro cavity is a crucial step towards sucessful implementation of efficient single photon sources and of many quantum information protocols.[1] We here investigate fiber based Fabry Perot cavities which consist of a flat dielectric mirror and an optical fiber. This cavity design has several advantages: it is tunable, can be scanned transversally and is automatically fiber-coupled with very good efficiency. To achieve stable cavities, a concave impression has been produced on the fiber facet by laser machining prior to deposition of a dielectric coating. Cavities using mirrors with radii of curvature of about 50 µm, with a finesse of up to 300 and a length of a few micrometers have been realized. We use defect centers in diamond nanocrystals as single emitters. The diamond nanocrystals are deposited onto the flat mirror by spin coating. Theoretical considerations show that the chosen cavity parameters should allow for enhancement of the defect center spontaneous emission by coupling it to the microcavity due to the Purcell effect.

[1] S. Prawer and A.D. Greentree, Science 320, 1601 (2008)