We report on the observation of oscillatory variations in the quality ͑Q͒ 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 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.
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Reitzenstein et al. (2009) studied this question.
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