Abstract
We study the origin of bright leaky-cavity mode emission and its influence on photon statistics in weakly coupled quantum dot - semiconductor cavity systems, which consist of a planar photonic-crystal and several quantum dots. We present experimental measurements that show that when the system is excited above the barrier energy, then bright cavity mode emissions with nonzero detuning are dominated by radiative recombinations of deep-level defects in the barrier layers. Under this excitation condition, the second-order photon autocorrelation measurements reveal that the cavity mode emission at nonzero detuning exhibits classical photon-statistics, while the bare exciton emission shows a clear partial anti-bunching. As we enter a Purcell factor enhancement regime, signaling a clear cavity-exciton coupling, the relative weight of the background recombination contribution to the cavity emission decreases. Consequently, the anti-bunching behavior is more significant than the bare exciton case - indicating that the photon statistics becomes more non-classical. These measurements are qualitatively explained using a medium-dependent master equation model that accounts for several excitons and a leaky cavity mode.
Highlights
A single quantum dot (QD) in an optical cavity interacts with a radiation field through a single photon
A modified theoretical analysis was recently presented by Hughes and Yao [12], who demonstrated that the the leaky cavity mode completely dominates the photon emission decay processes for planar photonic crystal (PhC) cavities, and the radiation-mode decay is basically negligible; for the measured spectrum, this manifests in a strong and robust cavity mode emission, even for large detunings, which is caused by the efficient photon feeding from the exciton to the off-resonant cavity mode
Press et al [8] reported that the quantum autocorrelation [g(2)(τ = 0)] of the exciton and the cavity emissions altogether, which appear as doublet in the spectrum due to the strong coupling, exhibit a clear anti-bunching under resonant excitation, but no anti-bunching under excitation above the barrier bandgap
Summary
A single quantum dot (QD) in an optical cavity interacts with a radiation field through a single photon. A modified theoretical analysis was recently presented by Hughes and Yao [12], who demonstrated that the the leaky cavity mode completely dominates the photon emission decay processes for planar PhC cavities, and the radiation-mode decay is basically negligible; for the measured spectrum, this manifests in a strong and robust cavity mode emission, even for large detunings, which is caused by the efficient photon feeding from the exciton to the off-resonant cavity mode. Such exciton-cavity feeding mechanisms affect the statistics of higher-order quantum correlation effects such as antibunching phenomena. They assert that these results constitute a direct manifestation of the photon blockade effect [13]
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