Abstract
We demonstrate exciton waveguiding and short wavelength lasing (460 nm at 300 K) in quantum dot structures based on submonolayer superlattices. High resolution electron microscopy studies reveal that CdSe submonolayer insertion in a ZnSe matrix forms an array of 2D nanoscale islands. Strong modulation in the optical reflectance spectra is observed in a 20 period submonolayer superlattice structure at energy corresponding to the localized exciton state, and the lasing occurs directly in the spectral region of the exciton-induced enhancement of the refractive index.
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