Stuttgart 2012 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 19: Quanteninformation: Festkörper und Photonen

Q 19.4: Vortrag

Montag, 12. März 2012, 17:15–17:30, V38.04

Realization of a fiber based microcavity for coupling a single N-V center in diamond — •Roland Albrecht¹, Christian Deutsch², Jakob Reichel², Tim Schröder³, Andreas W. Schell³, Oliver Benson³, and Christoph Becher¹ — ¹Fachrichtung 7.2, (Experimentalphysik), Universität des Saarlandes, Campus E2.6, 66123 Saarbrücken — ²Laboratoire Kastler Brossel, ENS/UPMC-Paris 6/CNRS, 24 rue Lhomond, 75005 Paris, France — ³Institut für Physik, AG Nanooptik, Humboldt-Universität zu Berlin, Newtonstraße 15, 12489 Berlin

Fiber based Fabry-Perot cavities [1] are promising candidates for coupling a single N-V center in diamond to a micro-cavity. On the fiber facets spherical imprints have been produced either by CO₂ laser machining or by focussed ion beam milling respectively prior to deposition of a dielectric coating. We achieve radii of curvature as small as 15 µ m and a depth of 1 µ m with a sub-nm surface roughness.
We investigate two different cavity setups: 1.) The cavity is built with one fiber mirror and a plane mirror onto which diamond nanocrystals containing single N-V centers have been spincoated. 2.) A cavity consisting of two fiber mirrors onto one of them a preselected diamond nanocrystal containing a single N-V center has been deposited.
These cavities are easily tunable and are automatically fiber-coupled. We have realized cavities with a Finesse of up to 4000 and a mode volume of less than 15 λ³.
[1] D. Hunger et al.,New J. Phys. 12, 065038 (2010)