Hannover 2013 – wissenschaftliches Programm
Q 9.7: Vortrag
Montag, 18. März 2013, 15:30–15:45, A 310
Coupling color centers in diamond to fiber based Fabry-Pérot microcavities — •Hanno Kaupp1,2, Christian Deutsch1,2, Roland Albrecht3, Elke Neu4, Christoph Becher3, Jakob Reichel5, Theodor W. Hänsch1,2, and David Hunger1,2 — 1Ludwigs-Maximilians-Universität München — 2Max-Planck Institut für Quantenoptik, Garching — 3Universität des Saarlandes — 4Universität Basel — 5Laboratoire Kastler Brossel, E.N.S, Paris
Optical fibers with machined and coated end facets can serve as high reflectivity mirrors to build low loss optical resonators with free space access. Such microcavities feature a very small mode volume on the order of a few tens of cubic wavelengths and a very large Finesse of up to 105, corresponding to quality factors of several millions. The resulting Purcell factor can ideally be as high as 104. This can involve a dramatic increase of the emission rate of an emitter inside the cavity.
We use the microcavities to couple color centers in diamond to the cavity. First results of coupling nitrogen-vacancy center (NV) ensembles to the cavity will be discussed. We demonstrate cavity enhanced emission and quantify the effective Purcell factor by analyzing optical spectra. The observed enhancement can be modeled with an effective Purcell factor taking the fast dephasing of the NV center into account.
In contrast to the broad spectral emission characteristics of NV centers, the silicon-vacancy (SiV) center in diamond can exhibit an emission linewidth of below 1 nm at room temperature. This holds promise to achieve much larger effective Purcell factors and emission rates. We will show first steps towards coupling SiV centers to microcavities.