Abstract

AbstractWe report on lasing of non‐polar GaN quantum dots which are integrated into novel cubic AlN microdisks. Optical spectroscopy of freestanding microdisks at low temperature (∼10 K) revealed distinct whispering gallery modes with quality factors up to Q ∼3000 in the high energy range around ∼4 eV of microdisks with a diameter of 4 µm. Furthermore, we obtained S‐shaped curves of the integral mode intensity, accompanied by a significant linewidth narrowing in power dependent micro‐photoluminescence experiments. The spontaneous emission coupling factors were determined to β = 0.26 and β = 0.58 with respect to the radial order of the resonator modes. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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