Mode selection in electrically driven quantum dot microring cavities

Alexander Schlehahn, Ferdinand Albert, Christian Schneider, Sven Höfling, Stephan Reitzenstein, Jan Wiersig, Martin Kamp*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


Within this paper a novel method for selecting certain lasing modes from a whispering gallery mode (WGM) spectrum of electrically pumped microrings is presented. Selection is achieved by introducing sub-wavelength sized notches of about 50nm width and 500nm depth to the sidewalls of ring shaped quantum dot micro cavities with 80 mu m diameter and ridge widths below 2 mu m. It is shown that the notches act as scattering centers, suppressing modes that have maxima in intensity at the notch position. By a variation of the angle between the notches, different repetitive patterns of lasing modes and suppressed modes are conceivable. (C) 2013 Optical Society of America

Original languageEnglish
Pages (from-to)15951-15958
Number of pages8
JournalOptics Express
Issue number13
Publication statusPublished - 1 Jul 2013


  • Whispering-gallery modes
  • Microdisk lasers
  • Emission


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