Abstract

Abstract : This final progress report summarizes research efforts in two areas: cavity QED of quantum dots and electromagnetically induced transparency (EIT) in GaAs quantum wells. Cavity QED studies are based on the development of a composite nanocrystal-microsphere system, in which CdSe/ZnS core/shell nanocrystals couple to whispering gallery modes (WGMs) in a fused silica microsphere. The composite microcavity system can feature a Q-factor as high as 108 and a nanocrystal decoherence rate as small as 3 microneV (0.75 GHz), indicating that the composite system can in principle reach the strong coupling regime of cavity QED. EIT studies have exploited the use of Coulomb interactions between excitons to induce and manipulate exciton spin coherence and biexciton coherence. These studies have led to the first experimental demonstration of EIT in inter-band optical transitions in semiconductors in A-type, cascaded, and V-type three-level systems.

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