Dresden 2011 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 7: Single Photon Sources and Qbits

HL 7.2: Talk

Monday, March 14, 2011, 11:15–11:30, FOE Anorg

Single Photon Emission from a Quantum Dot in a Photonic Crystal Waveguide — •Simon Pütz, Arne Laucht, Thomas Günthner, Norman Hauke, Max Bichler, Michael Kaniber, and Jonathan J. Finley — Walter Schottky Institut, Technische Universität München, Am Coulombwall 4, D-85748 Garching, Germany

We experimentally investigate a single self-assembled InGaAs quantum dot embedded in a GaAs photonic crystal W1 waveguide as a source of single photons. We locate the position of the quantum dot by performing spatially-resolved photoluminescence experiments. Low temperature measurements performed with detection perpendicular to the surface and with detection at the cleaved end of the waveguide allow us to qualitatively compare the emission properties of the same quantum dot for the different geometries. While the relative emission intensity depends on the coupling strength of the quantum dot to the waveguide, power-dependent and time-resolved measurements show similar characteristics. Most importantly, autocorrelation measurements prove the single photon character of emission, making such a system an ideal candidate for on-chip photonic applications.