Electron microscopy and optical spectroscopy of single InAs/InP quantum dots

Abstract

A technique is described which allows one to position a single InAs quantum dot or quantum dot arrays on the top of square based, pyramidal shaped InP nano-templated mesas. A simple geometrical calculation shows 80% of the InP material is incorporated during the template formation. Positioning of either a single quantum dot or quantum dot arrays is achieved depending on the size of the mesa top surface and the amount of dot material deposited as shown using both scanning electron microcopy and optical microscopy. Photoluminescence spectra from a single InAs quantum dot exhibits a clear s- and p-shell structure for the first time in this material system.