Propagation constant - Limited surface modes in dielectric superlattices

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The surface modes of a dielectric superlattice - their very existence - depend strongly on the position of the surface (the cut-plane through the last cell). For example, TE and TM surface waves can propagate even when the layer next to the surface is made of lower-index material. In this case we find a novel TE mode where the propagation constant is limited by a bulk band. For TM polarization, the propagation constant may be limited due to a different mechanism, namely the internal (within the dielectric layers εa, εb) Brewster effect. This upper bound is k0[εaεb/(εa+ εb)]1/2, where k0is the vacuum propagation constant.
Original languageAmerican English
Pages (from-to)1-5
Number of pages5
JournalOptics Communications
StatePublished - 1 Aug 1996


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