Numerical and experimental study of the Q factor of high-Q micropillar cavities

  • Gregersen N
  • Reitzenstein S
  • Kistner C
 et al. 
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Micropillar cavities are potential candidates for high-efficiency
single-photon sources and are testbeds for cavity quantum
electrodynamics experiments. In both applications a high quality (Q)
factor is desired. It was recently shown that the Q of high-Q
semiconductor micropillar cavities exhibit pronounced quasi-periodic
variations in the regime from 1 to 4 mu m, and a detailed understanding
of the variational behavior of the Q is required. Here, we study the
origin of these variations using a multi-mode Fabry-Perot model
appropriate for this regime. We analyze in detail contributions to the
effective reflectivity of the fundamental mode arising from coupling to
scattering channels involving higher-order cavity modes and propagating
Bloch modes in the distributed Bragg reflectors (DBRs). We show how
these weak contributions lead to strong variations of the Q factor, and
we relate the average periodicity of these variations to the thickness
of the DBRs and the derivative of the effective indices of the guided
Bloch modes. We also examine the influence of various geometrical
parameters, including the number of DBR layers pairs, the amplitude of
the corrugation of the pillar sidewalls and the number of etched layer
pairs in the bottom DBR on the Q versus diameter relation. Comparisons
are made between extensive numerical simulations and experimental
measurements, and a good qualitative agreement is found.

Author-supplied keywords

  • Bloch modes
  • Micropillar
  • Optical microcavities
  • Quality factor

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  • Niels GregersenTechnical University of Denmark

  • Stephan Reitzenstein

  • Caroline Kistner

  • Micha Strauss

  • Christian Schneider

  • Sven Höfling

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