Surface EM waves on 1D Photonic Crystals
  We study surface states of 1D photonic crystals using a semiclassical coupled wave theory. Both TE and TM modes are treated. We derive analytic approximations that clarify the systematics of the dispersion relations, and the roles of the various parameters defining the crystal. 
G. V. Morozov, D. W. L. Sprung, J. Martorell