Düsseldorf 2007 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 31: Poster Laserspektroskopie
Q 31.6: Poster
Dienstag, 20. März 2007, 16:30–18:30, Poster C
Optical spectroscopy of single silicon nanocrystals — •Mathias Grün1,2, Patrice Miska2, François Montaigne2, Hervé Rinnert2, Michel Vergnat2, David Steinmetz1, and Christoph Becher1 — 1Fachrichtung 7.3 (Technische Physik), Universität des Saarlandes, 66041 Saarbrücken — 2Laboratoire de Physique des Matériaux - UMR-CNRS 7556, Université Henri Poincaré Nancy I, Faculté des Sciences et Techniques, 54506 Vandoeuvre-lés-Nancy, France
Silicon crystals with sizes of few nanometers embedded in a silica matrix show an improved quantum efficiency for optical emission in comparison with bulk silicon yielding an intense photoluminescence signal in the spectral region around 700-800 nm. This surprising property is attributed to the quantum confinement of excitons in these nanocrystals, also called ”silicon quantum dots”. Such nanostructures are promising candidates for the realization of photonic devices and quantum optics experiments. Although the properties of an ensemble of silicon nanocrystals are well known the optical properties of a single silicon quantum dot are still not well understood. Thus, the investigation of single silicon nanocrystals will contribute to the understanding of their intense photoluminescence. Isolating single silicon nanocrystals would also allow for their emplyoment in quantum optics experiments.
Here, we report on the fabrication of silicon nanocrystals with sizes of about 3 nm embedded in thin silica films. The samples show intense luminescence at 770-800 nm depending on fabrication parameters. We discuss the luminescence properties and strategies to experimentally isolate single nanocrystals.