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 (1)

• Manipulation of the Spontaneous Emission Dynamics of Quantum Dots in 2D Photonic Crystals

Cited by in corpus (4)

• Investigation of Non Resonant Dot - Cavity Coupling in Two Dimensional Photonic Crystal Nanocavities
• Highly efficient single photon emission from single quantum dots within a two-dimensional photonic bandgap
• Decay dynamics of quantum dots influenced by the local density of optical states of two-dimensional photonic crystal membranes
• Electrically probing photonic bandgap phenomena in contacted defect nanocavities