Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 62: Poster: Quantum Optics and Photonics III
Q 62.50: Poster
Donnerstag, 26. März 2015, 17:00–19:00, C/Foyer
Ultra-small mode volume cavities for the enhancement of nitrogen-vacancy center fluorescence — •Hanno Kaupp1,2, Benedikt Schlederer1,2, Helmut Fedder3, Huan-Cheng Chang4, Theodor W. Hänsch1,2, and David Hunger1,2 — 1Ludwig-Maximilians-Universität, 80799 München, Germany — 2Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany — 3Universität Stuttgart, 70569 Stuttgart , Germany — 4Academia Sinica, Taipei 106, Taiwan
We apply tunable optical fiber microcavities to enhance the emission rate and to increase the coupling efficiency of Nitrogen-vacancy (NV) centers in diamond. Using diamond nanocrystals large enough to provide nanoscale field confinement by themselves ultimately small mode volumes can be realized. Embedding the crystals in between two silver mirrors a Fabry-Perot 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. We show emission lifetime changes by a factor of two for NV center ensembles, as well as an increase of collected photons by roughly an order of magnitude for single emitters.