Berlin 2014 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 54: Photonics I
Q 54.3: Talk
Friday, March 21, 2014, 11:15–11:30, UDL HS3038
Ultra-small mode volume cavities for the enhancement of NV center fluorescence — •Hanno Kaupp1,2, Andreas Weißl1,2, Philipp Häusser1,2, Aniket Agrawal1,2, Helmut Fedder3, Theodor W. Hänsch1,2, and David Hunger1,2 — 1Ludwig-Maximilians-Universität, München, Germany — 2Max-Planck-Institut für Quantenoptik, Garching, Germany — 3Universität Stuttgart, Stuttgart, Germany
We want to apply tunable optical microcavities as a tool to enhance the emission rate and to increase the photon collection efficiency of Nitrogen-vacancy (NV) centers in diamond. The coupling between the emitter and the cavity mode can be expressed by the Purell factor being proportional to the ratio of quality factor and mode volume. The emission rate into a particular cavity mode can be increased considerably, due to the Purcell effect.
In a new approach we use a diamond nanocrystal large enough to provide nano-scale field confinement by itself in order to build ultra-small mode volume cavities. Embedding the crystal between a pair of silver layers, a Fabry-Pérot cavity mode can be defined with mode volumes down to 0.1(λ/n)3. The resulting large Purcell enhancement (C∼5) and efficient outcoupling of the photons provide a way to build efficient solid state single photon sources as well as efficient spin-photon interfaces at ambient conditions.