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Q: Fachverband Quantenoptik und Photonik
Q 57: Photonik I
Q 57.7: Talk
Friday, March 6, 2009, 12:00–12:15, Audi-A
Optimization of microcavities in diamond-based photonic crystals — •Janine Riedrich-Möller, Elke Neu, 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 as isolated, photostable single photon emitters. For many future applications of color centers, e.g. quantum networks or probabilistic quantum computers [1], it is essential to couple these single emitters to a cavity mode of high Q-factor and small modal volume. Microcavities in diamond-based photonic crystal slabs offer the possibility for efficient coupling and large enhancement of the spontaneous emission (Purcell effect). Using Fourier- and real space analysis (FDTD), we optimize the structure according to the principles of "gentle confinement" [2]: By gentle 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. In practice, the Q-factor is primarily limited by absorption of the dielectric material. We investigate the influence of material absorption and discuss possible techniques to fabricate photonic crystal structures in thin nanocrystalline diamond films.
S. Prawer and A. D. Greentree, Science 320, 1601
(2008)
Y. Akahane, T. Asano, B.-S. Song and S. Noda,
Nature 425, 944 (2003)