J. Prineas, J. Kuhl, J.Y. Zhou, H. Gibbs, G. Khitrova, A. Knorr, S. Koch
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Ultrafast suppression and recovery of a resonant photonic bandgap
Resonant photonic bandgap structures, formed by Bragg-spaced quantum wells, are studied experimentally with resonant pump-probe spectroscopy. We find ultrafast suppression due to the ac Stark effect and ultrafast recovery enabled by superradiant decay of the coherent polarization.