Distinguishing zero-group-velocity modes in photonic crystals

  title={Distinguishing zero-group-velocity modes in photonic crystals},
  author={Michael Ghebrebrhan and Mihai Ibanescu and Steven G. Johnson and M. Solja and John. D. Joannopoulos},
We examine differences between various zero-group-velocity modes in photonic crystals, including those that arise from Bragg diffraction, anticrossings, and band repulsion. Zero-group velocity occurs at points where the group velocity changes sign, and therefore is conceptually related to “left-handed” media, in which the group velocity is opposite to the phase velocity. We consider this relationship more quantitatively in terms of the Fourier decomposition of the modes, by defining a measure… CONTINUE READING


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