Broadband Purcell enhanced emission dynamics of quantum dots in linear photonic crystal waveguides

Abstract

The authors investigate the spontaneous emission dynamics of self-assembled InGaAs quantum dots embedded in GaAs photonic crystal waveguides. For an ensemble of dots coupled to guided modes in the waveguide we report spatially, spectrally, and time-resolved photoluminescence measurements, detecting normal to the plane of the photonic crystal. For quantum dots emitting in resonance with the waveguide mode, a ~21x enhancement of photoluminescence intensity is observed as compared to dots in the unprocessed region of the wafer. This enhancement can be traced back to the Purcell enhanced emission of quantum dots into leaky and guided modes of the waveguide with moderate Purcell factors up to ~4x. Emission into guided modes is shown to be efficiently scattered out of the waveguide within a few microns, contributing to the out-of-plane emission and allowing the use of photonic crystal waveguides as broadband, efficiency-enhancing structures for surface-emitting diodes or single photon sources.

arXiv comment13 pages, 4 figures

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Cited by in corpus (8)

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• Radiative coupling of quantum dots in photonic crystal structures
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• Long-distance radiative excitation transfer between quantum dots in disordered photonic crystal waveguides
• Highly directed emission from self-assembled quantum dots into guided modes in disordered photonic crystal waveguides
• Semiconductor membranes for electrostatic exciton trapping in optically addressable quantum transport devices
• Controllable Spin-Resolved Photon Emission Enhanced by Slow-Light Mode in Photonic Crystal Waveguides on Chip