Abstract
An efficient single-photon source is one of the key components in quantum secure communication systems. In this work, a clean quantum-dot single-photon source without side walls, consisting of a planar microcavity structure with an aperture in the light-blocking top metal layer, is designed to prevent spectral diffusion of single-photon emission. Such a source with an aperture diameter of 1000 nm provides a photon collection efficiency of 14%, increased from 0.5% for a quantum dot in GaAs, and one with an 800-nm aperture provides a Purcell enhancement of 1.7 with an excellent far-field radiation pattern. The dependences of the emission characteristics on the aperture size and the quantum dot misplacement are also investigated.
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