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Nano Lett. 2008 Jun;8(6):1709-12. doi: 10.1021/nl080661a. Epub 2008 May 10.

Quantum dot microdrop laser.

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  • 1Institute of Optics, Information and Photonics, Max-Planck Research Group, University of Erlangen-Nuremberg, Erlangen, Germany.


We report single-mode and multimode lasing from isolated spherical liquid microcavities containing CdSe/ZnS nanocrystal quantum dots. Lasing is observed at densities more than 2 orders of magnitude lower than previously demonstrated or theoretically predicted, assuming a uniform nanocrystal quantum dot distribution. Charged droplets, between 10 and 40 microm in size, are electrodynamically levitated and optically pumped. Substantial laser signals at low thresholds are measured from the directional emission normal to the pump beam, owing to the high Q cavity modes.

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