Abstract
We present cavity quantum electrodynamics experiments performed on single quantumdots embedded in two-dimensional photonic crystal nanocavities. We begin by describingthe structural and optical properties of the quantum dot sample and the photoniccrystal nanocavities and compare the experimental results with three-dimensionalcalculations of the photonic properties. The influence of the tailored photonicenvironment on the quantum dot spontaneous emission dynamics is studied usingspectrally and spatially dependent time-resolved spectroscopy. In ensemble andsingle dot measurements we show that the photonic crystals strongly enhance thephoton extraction efficiency and, therefore, are a promising concept for realizingefficient single-photon sources. Furthermore, we demonstrate single-photon emissionfrom an individual quantum dot that is spectrally detuned from the cavity mode.The need for controlling the spectral dot–cavity detuning is discussed on thebasis of shifting either the quantum dot emission via temperature tuning or thecavity mode emission via a thin film deposition technique. Finally, we discussthe recently discovered non-resonant coupling mechanism between quantum dotemission and cavity mode for large detunings which drastically lowers the purity ofsingle-photon emission from dots that are spectrally coupled to nanocavity modes.
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