Oscillatory variations in the Q factors of high quality micropillar cavities

Reitzenstein, S.; Gregersen, N.; Kistner, C.; Strauss, M.; Schneider, C.; Pan, L.; Nielsen, T. R.; Höfling, S.; Mørk, J.; Forchel, A.
February 2009
Applied Physics Letters;2/9/2009, Vol. 94 Issue 6, pN.PAG
Academic Journal
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 μm, 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.


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