Figure 1.

Low-temperature photoluminescence taken from mesa structures. (a) μPL spectrum of QDs taken from 10-μm mesa size grown by DE at 410°C; the inset is a typical PL spectrum of a single QD taken from 0.5-μm mesa size at very low laser excitation power. (b) PL spectra of a single QD under cw optical excitation, recorded for different laser excitation powers.