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Q: Fachverband Quantenoptik und Photonik

Q 43: Poster II

Q 43.65: Poster

Mittwoch, 20. März 2013, 16:00–18:30, Empore Lichthof

Realization of a fiber based microcavity for coupling a single N-V center in diamond — •Alexander Bommer¹, Roland Albrecht¹, Christian Deutsch², Jakob Reichel², 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

The coupling of color centers in diamonds to optical cavities is an important technology for realizing light-matter interfaces in many quantum information protocols. We here investigate coupling of single N-V-centers in nanodiamonds to fiber based micro-cavities. The cavity consists of a fiber mirror and a plane mirror with a length of <5µ m. The fiber mirror is produced by laser machining a fiber facet to yield a spherical imprint with radii of curvature of about 80 µ m and depths of 1 µ m with a sub-nm surface roughness, followed by deposition of a dielectric mirror stack [1]. Nanodiamonds containing single N-V-centers have been spin coated onto the plane mirror which is mounted in thermal contact with the cold finger of a liquid helium flow cryostat. At room temperature we observe phonon assisted emission of photons into the cavity mode and realize a single photon source tunable over the entire NV-emission spectrum. Theoretical simulations of the coupled emitter-cavity system predict that cooling of the nanodiamonds will allow to observe Purcell enhanced emission of the Zero-Phonon Line into the cavity mode.

[1] D. Hunger et al.,New J. Phys. 12, 065038 (2010)