Dispersion regions overlapping for bulk and surface polaritons in a   magnetic-semiconductor superlattice
  Extraordinary dispersion features of both bulk and surface polaritons in a finely-stratified magnetic-semiconductor structure which is under an action of an external static magnetic field in the Voigt geometry are discussed in this letter. It is shown that the conditions for total overlapping dispersion regions of simultaneous existence of bulk and surface polaritons can be reached providing a conscious choice of the constitutive parameters and material fractions for both magnetic and semiconductor subsystems. 
Volodymyr I. Fesenko, Illia V. Fedorin, Vladimir R. Tuz
cond-mat.mtrl-sci physics.optics