2008/02/29 by B. Julsgaard, Brian Julsgaard, J. Johansen +9
Engineering · Physics and Astronomy · #Band gap #Condensed matter physics #Crystal (programming language) #Density of states #Diffraction #Lattice constant #Materials science #Molecular physics #Optics #Optoelectronics #Photonic Crystals and Applications #Photonic and Optical Devices #Photonic crystal #Photonics #Physics #Quantum dot #Semiconductor Quantum Structures and Devices #Spontaneous emission #cond-mat.mes-hall
paper · pdf · doi:10.1063/1.2977605
published as Appl. Phys. Lett., vol. 93, 094102 (2008) · 9 pages (preprint), 3 figures
openalex publication_date 2008/09/01 · arxiv created 2008/09/02 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.