Abstract
We demonstrate the triggered generation of photon pairs by the cascaded biexciton-exciton emission from a single (In,Ga)As∕GaAs quantum dot (QD) in a pillar microcavity. Photon cross-correlation measurements between the biexciton and exciton decay reveal highly asymmetric features under continuous wave excitation and a bunching effect under pulsed excitation due to the cascaded nature of the process. An enhancement of the QD photoluminescence (PL) intensity by a factor of 40 was found for pillar microcavities (0.6μm diameter) compared to the excitonic PL intensity in bulk semiconductors, thus reflecting the enhanced photon collection effect out of the cavity structure. The observed pillar mode structure is well understood on the basis of an extended transfer-matrix method.
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