Hannover 2010 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 21: Poster I
Q 21.61: Poster
Tuesday, March 9, 2010, 16:00–19:00, Lichthof
Towards emitter-cavity-coupling of new single color centers in diamond — Roland Albrecht, •Christian Hepp, Elke Neu, Janine Riedrich-Möller, David Steinmetz, and Christoph Becher — Technische Physik, Universität des Saarlandes, D-66123 Saarbrücken
An approach to increase the viability of single color centers in diamond is to couple their optical emission to microcavities. 2D photonic crystal microcavities (PhC) are being considered as well suited candidates for this task providing theoretical Q-factors of 105 at modal volumes of less than 1 (λ/n)3 as well as an integral scalability. We show preliminary results on PhC realization in thin (300 nm) nanocrystalline diamond films produced by focused ion beam milling that suggest a Q-factor of ≈ 100 which is limited by the material absorption as we conclude from our theoretical models.
On the other hand the state-of-the-art single photon emitter in diamond - the NV-center - turns out to be only poorly suited for a coupling of its zero phonon line to a cavity mode because it radiates predominantly into broad vibronic sidebands. On the road to find defects with smaller linewidth we report on Si- and Ni-based color centers in bulk diamond. The Ni-center (810 nm) exhibits a high signal-to-noise-ratio (69 kcounts/s) and a small linewidth of 2 nm at room temperature; moreover it proofs clear single photon emission featuring a second-order-correlation function of g2(0) = 0.1. Silicon vacancy (SiV) centers were created by spatially resolved ion implantation showing the high potential of this technique for SiV-centers.