Resonant and localized electromagnetic modes in finite superlattices

The existence and behavior of surface and interface optical waves are studi ed in a substrate-finite-superlattice-air system. These modes appear as wel l-defined peaks in the density of states as well as in the magnitudes and p hase times of the reflection and transmission coefficients. We investigate the effect of surface termination on the formation of surface modes and the ir interaction with the;superlattice-substrate interface modes. The plot of the spatial distribution of the modes shows different possibilities of the guidance through the localized and confined modes.