Engineered Optical Nonlocality in Nanostructured Metamaterials
  We analyze dispersion properties of metal-dielectric nanostructured metamaterials. We demonstrate that, in a sharp contrast to the results for the corresponding effective medium, the structure demonstrates strong optical nonlocality due to excitation of surface plasmon polaritons that can be engineered by changing a ratio between the thicknesses of metal and dielectric layers. In particular, this nonlocality allows the existence of an additional extraordinary wave that manifests itself in the splitting of the TM-polarized beam scattered at an air-metamaterial interface. 
Alexey A. Orlov, Pavel M. Voroshilov, Pavel A. Belov, Yuri S. Kivshar
physics.optics