Hamburg 2009 – scientific programme
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SYDD: Defect centers in diamond for applications in quantum optics and nanophotonics
SYDD 1: Defect centers in diamond for applications in quantum optics and nanophotonics I
SYDD 1.4: Talk
Friday, March 6, 2009, 12:00–12:15, Audi-B
Towards optical interfaces for color centers in diamond — Roland Albrecht, Janine Riedrich-Moeller, Elke Neu, David Steinmetz, Christian Hepp, and •Christoph Becher — Fachrichtung 7.3 (Technische Physik), Universität des Saarlandes, Campus E 2.6, 66123 Saarbrücken
In recent years color centers in diamond have attracted significant interest for applications in quantum information. For many of these applications, e.g. quantum networks, it is essential to couple single color centers to a cavity mode with high quality-factor Q and small modal volume in order to coherently manipulate, readout and transfer the center’s quantum state. We follow two different routes towards realization of such optical interfaces: coupling to microcavities based on fiber mirrors or microcavities defined within diamond-based photonic crystals (PhC). The fiber based Fabry-Perot cavities consist of a flat mirror onto which diamond nanocrystals are deposited by spin coating and a fiber mirror where a concave impression has been produced on the fiber facet by laser machining. We demonstrate cavities with lengths of a few microns and finesse of about 300, sufficient for observing modified spontaneous emission. In addition, we present optimized designs based on Fourier- and real space analysis of PhC defect cavity structures. By careful variation of the field envelope, vertically radiated power can be suppressed and the Q-factor can be improved significantly up to Q ≈ 320000 at a modal volume of V = 0.35 (λ/n)3. We discuss routes for fabrication of diamond-based PhC cavities.