Bright single photon source based on self-aligned quantum dot-cavity systems
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We report on a quasi-planar quantum-dot-based single-photon source that shows an unprecedented high extraction efficiency of 42% without complex photonic resonator geometries or post-growth nanofabrication. This very high efficiency originates from the coupling of the photons emitted by a quantum dot to a Gaussian shaped nanohill defect that naturally arises during epitaxial growth in a self-aligned manner. We investigate the morphology of these defects and characterize the photonic operation mechanism. Our results show that these naturally arising coupled quantum dot-defects provide a new avenue for efficient (up to 42% demonstrated) and pure (g2(0) value of 0.023) single-photon emission. (C) 2014 Optical Society of America
Maier , S , Gold , P , Forchel , A , Gregersen , N , Mork , J , Höfling , S , Schneider , C & Kamp , M 2014 , ' Bright single photon source based on self-aligned quantum dot-cavity systems ' Optics Express , vol 22 , no. 7 , pp. 8136-8142 . DOI: 10.1364/OE.22.008136
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This work was financially supported by the German Ministry of Education and Research (BMBF) via the project QuaHL-Rep and by the State of Bavaria.
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