The emission properties of ZnSe-based monolithic microcavities with either quantum wells or quantum dots embedded are studied. These pillar structured samples reveal three-dimensional confined optical modes with high-quality factors and small mode volumes confirmed by theoretical calculations. We observed a strong enhancement of the emission intensity for quantum dots being in the spectral resonance with the cavity modes. The Purcell effect was probed by using time-resolved measurements. A pronounced enhancement of the spontaneous emission rate of quantum dots coupled to the discrete optical modes of the cavities demonstrates the occurrence of cavity quantum electrodynamics effects. The observed enhancement depends systematically on the pillar diameter and, thus, on the Purcell factor of the individual pillars.
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