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Nonorthogonal pairs of copropagating optical modes in deformed microdisk cavities

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  • Jan Wiersig
  • Alexander Eberspächer
  • Jeong-Bo Shim
  • Jung-Wan Ryu
  • Sususmu Shinohara
  • M. Hentschel
  • Henning Schomerus
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Article number023845
<mark>Journal publication date</mark>29/08/2011
<mark>Journal</mark>Physical review a
Issue number2
Volume84
Number of pages0
Publication StatusPublished
<mark>Original language</mark>English

Abstract

Recently, it has been shown that spiral-shaped microdisk cavities support highly nonorthogonal pairs of copropagating modes with a preferred sense of rotation (spatial chirality) [ J. Wiersig et al. Phys. Rev. A 78 053809 (2008)]. Here, we provide numerical evidence which indicates that such pairs are a common feature of deformed microdisk cavities which lack mirror symmetries. In particular, we demonstrate that discontinuities of the cavity boundary such as the notch in the spiral cavity are not needed. We find a quantitative relation between the nonorthogonality and the chirality of the modes which agrees well with the predictions from an effective non-Hermitian Hamiltonian. A comparison to ray-tracing simulations is given.

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©2011 American Physical Society