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.
Keywords
Cite
@article{arxiv.1205.1286,
title = {Broadband Purcell enhanced emission dynamics of quantum dots in linear photonic crystal waveguides},
author = {Arne Laucht and Thomas Günthner and Simon Pütz and Rebecca Saive and Simon Frédérick and Norman Hauke and Max Bichler and Markus-Christian Amann and Alexander W. Holleitner and Michael Kaniber and Jonathan J. Finley},
journal= {arXiv preprint arXiv:1205.1286},
year = {2012}
}
Comments
13 pages, 4 figures