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Theory of on-chip quantum light emitters using semiconductor quantum dots and planar photonic crystals


Last year, Hennessy et al. (Nature, v445, 896 (2007)) presented an experimental study of the puzzling quantum nature of a single semiconductor quantum dot strongly coupled to a planar photonic-crystal nanocavity. With the quantum dot strategically positioned close to an electromagnetic field antinode spatial position, optical measurements clearly observe the strong-coupling regime, giving rise to the familiar anti-crossing behavior that occurs between a single exciton and cavity mode. In addition to the usual cavity-QED regimes well known from atomic optics, Hennessy et al. highlighted several apparent mysteries, unique to the semiconductor environment. These effects include  "off-resonant excitation of the cavity mode''  and a "triple peak'' during the strong coupling regime. This talk will try to explain these so-called mysteries (which have now been observed by a number of groups around the world) using a quantized medium-dependent theory, and then introduce some of our recent designs for realizing efficient quantum light sources on-chip.