Berlin 2012 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 93: Poster Session: Metal-Semiconductor Hybrid Systems, Plasmonic Systems / Photonic Crystals / Carbon: Diamond & CNT / Quantum Information Systems
HL 93.12: Poster
Donnerstag, 29. März 2012, 16:00–19:00, Poster D
Enhanced spontaneous emission from quantum dots in short photonic crystal waveguides — •Johannes Beetz1, Thang Hoang2, Leonardo Midolo2, Matthias Skacel2, Matthias Lermer1, Sven Höfling1, Laurent Balet2,3, Nicolas Chauvin2, Andrea Fiore2, and Martin Kamp1 — 1Universität Würzburg, Technische Physik, Am Hubland, 97074 Würzburg, Germany — 2COBRA Research Institute, Eindhoven University of Technology, P.O. Box 513, NL-5600MB Eindhoven, The Netherlands — 3École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
Single photon emitters are key building blocks for the implementation of many quantum information processing schemes. Photonic crystal waveguides (WGs) which contain semiconductor quantum dots (QDs) are perfectly suited for this purpose because they can be easily integrated into on-chip photonic circuits. We fabricated WGs with short lengths (10-25 μm) to avoid localization of light and probed the photoluminescence from the top of the WG and from the cleaved facet. In agreement with simulations, we observe Fabry-Pérot modes formed by the two WG end facets in the slow-light regime of the dispersion curve.
The spontaneous emission of the QDs within the WGs is enhanced by a factor of 1.7. Furthermore, the coupling efficiency of the QD emission into the slow-light mode is estimated to be around 50%. The broad spectral range of the slow-light mode and the large WG mode volume allow for large photon collection efficiencies even in the case of limited spectral and spatial matching.