Near-field optical spectroscopy of multiple stacked planes of GaN/AlN quantum dots
Gucciardi, P. G.Vinattieri, A.Colocci, M.Damilano, B.Grandjean, N.Semond, F.Massies, J.
Abstract
We have investigated the photoluminescence properties of GaN quantum dots with sub-micron lateral resolution by means of Near-Field Scanning Optical Microscopy (SNOM) operating in illumination mode. The analyzed sample consists of several stacked planes of GaN/AlN quantum dots grown by molecular beam epitaxy on Si(111) substrate. A clear correlation between the surface topography measured by Atomic Force Microscopy on uncapped samples and the SNOM luminescence maps has been found.
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