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Single lateral InGaAs quantum dot molecules have been embedded in a planarmicro-cavity in order to increase the luminescence extraction efficiency. Usinga combination of metal-organic vapor phase and molecular beam epitaxy samplescould be produced that exhibit a 30 times enhanced single-photon emission rate.We also show that the single-photon emission is fully switchable between twodifferent molecular excitonic recombination energies by applying a lateralelectric field. Furthermore, the presence of a polarization fine-structuresplitting of the molecular neutral excitonic states is reported which leads totwo polarization-split classically correlated biexciton exciton cascades. Thefine-structure splitting is found to be on the order of 10 micro-eV.

journal of applied physics

Polarization fine-structure and enhanced single-photon emission of  self-assembled lateral InGaAs quantum dot molecules embedded in a planar  micro-cavity