Decay dynamics of quantum dots influenced by the local density of optical states of two-dimensional photonic crystal membranes

Brian Julsgaard, Jeppe Johansen, Søren Stobbe, T. Stolberg-Rohr, T. Sünner, M. Kamp, A. Forchel, Peter Lodahl

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We have performed time-resolved spectroscopy on InAs quantum dot ensembles in photonic crystal membranes. The influence of the photonic crystal is investigated by varying the lattice constant systematically. We observe a strong slow down of the quantum dots’ spontaneous emission rates as the two-dimensional bandgap is tuned through their emission frequencies. The measured band edges are in full agreement with theoretical predictions.We characterize the multiexponential decay curves by their mean decay time and find enhancement of the spontaneous emission at the bandgap edges and strong inhibition inside the bandgap in good agreement with local density of states calculations.
Original languageEnglish
JournalApplied Physics Letters
Issue number9
Pages (from-to)094102
Publication statusPublished - 2008

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Copyright (2008) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.



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