Efficient Spatial Redistribution of Quantum Dot Spontaneous Emission from 2D Photonic Crystals

Abstract

We investigate the modification of the spontaneous emission dynamics and external quantum efficiency for self-assembled InGaAs quantum dots coupled to extended and localised photonic states in GaAs 2D-photonic crystals. The 2D-photonic bandgap is shown to give rise to a 5-10 times enhancement of the external quantum efficiency whilst the spontaneous emission rate is simultaneously reduced by a comparable factor. Our findings are quantitatively explained by a modal redistribution of spontaneous emission due to the modified local density of photonic states. The results suggest that quantum dots embedded within 2D-photonic crystals are suitable for practical single photon sources with high external efficiency.

References in corpus (3)

• Self-tuned quantum dot gain in photonic crystal lasers
• Photon Antibunching from a Single Quantum Dot-Microcavity System in the Strong Coupling Regime
• Manipulation of the Spontaneous Emission Dynamics of Quantum Dots in 2D Photonic Crystals

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