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Whispering gallery mode lasing in electrically driven quantum dot micropillars

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8 Author(s)
Albert, F. ; Technische Physik and Wilhelm Conrad Röntgen Research Center for Complex Material Systems, Physikalisches Institut, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany ; Braun, T. ; Heindel, T. ; Schneider, C.
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We report on whispering gallery mode lasing in electrically driven quantum dot micropillar cavities. The high quality microcavity structures feature whispering gallery mode emission with Q-factors up to 40 000 and laser threshold currents below 10 μA for devices with diameters between 2.6 and 5.6 μm. For large diameter micropillars a coexistence of lasing from two whispering gallery modes is realized which could be the basis for efficient terahertz generation via difference frequency generation.

Published in:

Applied Physics Letters  (Volume:97 ,  Issue: 10 )