Graphene-based polaritonic crystal
  It is shown that monolayer graphene deposited on a spatially-periodic gate behaves as a polaritonic crystal. Its band structure depending on the applied gate voltage is studied. The scattering of electromagnetic radiation from such a crystal is presented calculated and analyzed in terms of Fano-type resonances between the reflected continuum and plasmon-polariton modes forming narrow bands. 
Yuliy V. Bludov, Nuno M. R. Peres, Mikhail I. Vasilevskiy
cond-mat.mes-hall