Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 30: Poster: Photonics, laser development and applications, ultrashort laser pulses, quantum effects

Q 30.4: Poster

Dienstag, 18. März 2014, 16:30–18:30, Spree-Palais

Coupling of a single NV center in diamond to a fiber-based microcavity — •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/CNRS, 24 rue Lhomond, 75005 Paris, France

The read-out of the spin state of a NV center in diamond would profit enormously from coupling the NV’s optical transition to a microcavity. We here report on such a coupling to a fiber-based microcavity with a length <5µ m. The cavity consists of a plane mirror and a micro-mirror, which is fabricated on the facet of a single mode optical fiber. This fiber defines an output channel for the emitted photons. Nanodiamonds containing single NV centers are spin coated onto the plane mirror. Making use of the NV’s broadened emission and thus entering a regime of phonon assisted cavity feeding, this setup provides a narrow-band and tunable single photon source over the whole NV emission spectrum at room temperature [1]. Theoretical simulations based on a master equation model predict that reducing the NV center’s linewidth via cooling the nanodiamonds will allow to observe Purcell enhanced emission into the cavity mode. For our experimental parameters up to 65% of the emission could be channelled into the cavity. We show that such a fiber-based cavity works well at cryogenic temperatures. To reach necessary linewidths of about 10GHz we have to overcome spectral diffusion by using nanodiamonds containing less substitutional nitrogen. [1] R.Albrecht et al., PRL 110, 243602 (2013)