Absorption spectroscopy of single InAs self-assembled quantum dots

Excitonic transitions of single InAs self-assembled quantum dots were directly measured at View the MathML source in an optical transmission experiment. We use the Stark effect in order to tune the exciton energy of a single quantum dot into resonance with a narrow-band laser. With this method, sharp resonances in the transmission spectra are observed. The oscillator strengths as well as the homogeneous line widths of the single-dot optical transitions are obtained. A clear saturation in the absorption is observed at modest laser powers.