Stuttgart 2012 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 23: Photonik 1
Q 23.2: Talk
Tuesday, March 13, 2012, 10:45–11:00, V38.01
Coupling of colour centres to photonic crystal cavities in diamond — •Laura Kipfstuhl1, Janine Riedrich-Möller1, Christian Hepp1, Elke Neu1, Martin Fischer2, Stefan Gsell2, Matthias Schreck2, and Christoph Becher1 — 11Universität des Saarlandes, Fachrichtung 7.2, 66123 Saarbrücken — 2Universität Augsburg, Experimentalphysik IV, 86159 Augsburg
Colour centres in diamond are a very attractive system for realisation of basic building blocks for quantum information processing. Many of the proposed schemes, e.g. cavity enhanced single photon sources, cavity based spin measurements or optical qubits in quantum networks, require coupling of color centres to a cavity mode of high quality factor and small mode volume. Photonic crystal cavities directly fabricated in single crystal diamond allow for such coupling with high efficiency and low losses.
Here we present the fabrication of 1D and 2D photonic crystal cavities in single crystal diamond grown on iridium. Free-standing diamond membranes are produced with dry-etching techniques and patterned by focussed ion beam milling. We realise 1D nanobeam cavities in freestanding waveguides as well as 2D cavities. The experimentally obtained Q-factors are up to 700 with modal volumes on the order of one cubic wavelength. The resonance wavelength of both cavity types can be shifted up to 15 nm in a controlled post-processing procedure. Using this procedure, we tune a cavity mode of a 2D cavity into resonance with the zero phonon line of an ensemble of intrinsic SiV centres and observe a Purcell enhancement of the spontaneous emission.