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We study the optical emission from single semiconductor quantum dots coupledto the optical modes of photonic crystal nanocavities. For dots that are bothspectrally and spatially coupled, auto-correlation measurements revealefficient single photon generation, with a drastically reduced lifetime due tothe Purcell-effect. However, the multi-photon emission probability is enhancedcompared to the same QD transition when it is detuned from the cavity mode bycontrolled $N_2$-deposition. This indicates the presence of an emissionbackground that is shown to be related to the dot using photoncross-correlation spectroscopy. Photon temporal correlations persist even forlarge spectral detunings beyond $\Delta\lambda\sim-10 nm$, excluding theintrinsic QD continuum and phonon mediated processes as being responsible forthe cavity mode emission background. We propose a mechanism based on photoninduced shake up processes in the charged quantum dots, enhanced by the opticalcavity.

Investigation of Non Resonant Dot - Cavity Coupling in Two Dimensional Photonic Crystal Nanocavities