Oscillatory variations in the Q factors of high quality micropillar cavities

S. Reitzenstein*, N. Gregersen, C. Kistner, M. Strauss, C. Schneider, L. Pan, T. R. Nielsen, Sven Höfling, J. Mork, A. Forchel

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)


We report on the observation of oscillatory variations in the quality (Q) factor of quantum dot-micropillar cavities based on planar Bragg reflectors. The oscillatory behavior in the Q versus diameter dependence appears in the diameter range between 1.0 and 4.0 mu m, has a characteristic period of a few hundred nanometers and increases in amplitude with increasing reflectivity of the planar microcavity structures. The experimental results are well reproduced by numerical calculations which support the interpretation that the Q oscillations are caused by coupling of propagating Bloch modes of different orders at the mirror interfaces.

Original languageEnglish
Article number061108
Number of pages3
JournalApplied Physics Letters
Issue number6
Publication statusPublished - 9 Feb 2009


  • Bragg gratings
  • microcavities
  • micromirrors
  • optical planar waveguides


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