META Conference, META'10

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Folded Bands in Metamaterial Photonic Crystals
Parry Yu Chen

Last modified: 2009-11-07


We present band structure calculations of photonic crystals composed of both positive and negative refractive index materials. These structures exhibit bands that feature both positive and negative group velocities, producing folded bands that do not span the entire Brillouin zone. We derive a mathematical condition for the existence of folded bands from an energy flux relation, which shows that modal group velocity changes sign as field intensity transitions from the positive to the negative group index material. These band topologies are shown to persist when loss is added to the simulation.