Spatially resolved spectroscopy of single and coupled quantum dots

Optical properties of single and coupled quantum dots are studied with high spatial resolution. Several techniques are used to resolve spectra of indi vidual dots. Spatially isolated dots produced by double cleaved edge overgr owth are investigated by diffraction limited spectroscopy using a special m icroscope setup. Self-assembled InGaAs dots have been investigated by nearf ield optical techniques with metallic masks and by scanning tunneling micro scopy cathodoluminescence. Photoluminescence and photoluminescence excitati on spectra of selected quantum dots are discussed which reveal detailed inf ormation on ground and excited states as well as their coupling with neighb oring dots.