Abstract
AbstractWe present cavity quantum electrodynamics (cQED) effects in electrically driven high quality (high‐Q) quantum dot‐micropillar cavities. An optimized current injection scheme is employed, which enables simultaneously efficient electrical pumping and efficient out‐coupling of light: A ring‐shaped electrical contact leaving the upper facet of the pillars free from any absorbing material is used for efficient current injection and additionally serves as an aperture. This approach helps to suppress the detection of spontaneous emission from QDs through the sidewalls of the micropillars and leads to very clean electroluminescence spectra. Temperature tuning of single quantum dots (QDs) excitons allows us to observe Purcell‐enhancement of the spontaneous emission for QDs interaction with the fundamental mode as well as higher order modes. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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