PL spectrum indicating the existence of both type-A and type-B QD ensembles on the same sample. Emission from the surrounding barrier is also present at about 1.9 eV.
(a) The decay time of type-A and type-B QD ensembles as a function of power density under nonresonant excitation conditions. (b) Proposed alignment of the type-B QD band structure in equilibrium and under high optical excitation.
Exciton emission observed from single-QDs (in 100 nm mesas) at 4 K under cw excitation at 2.331 eV (532 nm) and a power density of . In each spectrum the individual peaks appear to originate from separate QDs.
A cw photon correlation measurement recorded at 4 K and a power density of , from the QD exciton peak (centered at 1.6558 eV) shown in the inset. The fit yields a time constant of 1.26 ns which is reasonably consistent with the value of 1.61 ns obtained from the ensemble data at the same power.
A pulsed photon correlation measurement recorded at 4 K and a power density of , from the InP QD peak.
Article metrics loading...
Full text loading...