Coupling semiconductor nanocrystals to a fused-silica microsphere: a quantum-dot microcavity with extremely high Q factors

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Abstract
We demonstrate a quantum-dot microcavity by coupling core–shell semiconductor nanocrystals to a fused-silica microsphere. We show that the composite microcavity can feature Q factors of the order of 108, providing a model system for investigating cavity QED and microlasers at the level of single quantum dots.