Enhanced light emission ofInxGa1−xAsquantum dots in a two-dimensional photonic-crystal defect microcavity

The interaction of self-assembled ${\mathrm{In}}_x{\mathrm{Ga}}_{1-x}\mathrm{As}$ quantum dots with nondegenerate modes of a two-dimensional photonic-crystal defect microcavity has been investigated in the weak-coupling regime. Photoluminescence intensity measurements show a transition from a pump rate limited regime at low excitation to cavity-controlled modes at high excitation. We observe considerably different saturation levels for quantum dots on and off the defect resonance. An enhancement of light emission by a factor of 9 due to the Purcell effect is obtained from this saturation behavior. Using the different temperature shifts of the quantum dot emission lines and the cavity mode, individual dots are tuned in and out of resonance, thus controlling their spontaneous emission rate.