ENHANCED SPONTANEOUS EMISSION BY QUANTUM BOXES IN A MONOLITHIC OPTICAL MICROCAVITY

Semiconductor quantum boxes (QB's) are well suited to cavity quantum e lectrodynamic experiments in the solid state because of their sharp em ission. We study by time-resolved photoluminescence InAs QB's placed i n the core of small-volume and high-finesse GaAs/AlAs pillar microreso nators. A spontaneous emission rate enhancement by a factor of up to 5 is selectively observed for the QB's which are on resonance with one- cavity mode. We explain its magnitude by considering the Purcell figur e of merit of the micropillars and the effect of the random spatial an d spectral distributions of the QB's.