Slow-light dispersion properties of multiatomic multiband coupled-resonator optical waveguides

Sunkyu Yu, Xianji Piao, Namkyoo Park

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In this paper, we investigate the dispersion properties of a multiatomic coupled-resonator optical waveguide (CROW), and show the existence of band-dependent group velocities in its slow-light bands. By including the next-nearest-neighbor coupling terms in a coupled-mode theory (CMT) analysis for the structure, we explain the physical origin of the band-dependent group velocities in terms of the modification of molecular mode-coupling strengths, and also derive the criteria for complete band separation and perfect intermode intensity overlap. Our results imply that when estimating the performance of a multiwave slow-light device, the band dependency of group velocities must also be considered in addition to the conventional CROW dispersion. Numerical analysis with a photonic crystal platform shows excellent agreement with theory.

Original languageEnglish
Article number023823
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number2
StatePublished - 21 Feb 2012


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