ABSTRACT
We observed a single photoluminescence peak from a single GaAs/AlGaAs quantum dot, of which the effective size and period are 60 x 60 x 14 nm and 2μm, respectively, using μ-photoluminescence measurement system. The broadening of spectral linewidth is suppressed with the decrease of the excitation laser power, which is mainly due to reduced quantized levels' filling effect. The minimal spectral linewidth observed is 0.9 meV with a low excitation laser power. The time-resolved measurement was also carried out with a streak camera. The use of the near-field optical microscope was also investigated. Finally, using the μ-photoluminescence technique, the two-dimensional electrons' motion in a point contact structure successfully visualized. Time- and spatial resolved optical characterization is essential for nano- and mesocsopic structures.
