Abstract
We report on the development of microcavity single photon sources in which optical and electrical confinement is achieved by means of a ring of low refractive-index aluminium oxide, buried within an etched mesa. The aluminium oxide is formed by the wet oxidation of aluminium rich AlGaAs layers. We demonstrate Purcell-enhanced emission from a quantum dot coupled to an oxide-confined cavity mode. When integrated into a diode architecture, the oxide annulus serves as a current aperture and electroluminesence is only observed from quantum dots in the confined current path. The oxide aperture does not impede the electrical properties of the diode, allowing the device to be driven using high frequency electrical pulses.
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