Photomodulated reflectance studies of quantum dot in MCLED structures: monitoring cavity-ground state exciton resonance

Self-assembled quantum dots emitting around 1.3 mu m and embedded in a microcavity structure are analysed by photo-reflectance (PR) measurements performed at different temperatures. The temperature dependence of the PR spectra line-shape and amplitude allows us to determine the tuning condition of the quantum dot ground state transition with the cavity mode. We found that in our structure the perfect tuning is obtained around 250 K