Abstract
The electromagnetic theory of gratings, previously developed to study the diffracted field, is applied to determine the field inside the material in order to obtain the characteristics of the surface polariton wave. The results predict a large enhancement of the surface polariton intensity and depression of the surface polariton dispersion curve as the groove depth is increased. The former effect is related to the existence of Wood anomalies of gratings. It is shown that one must carefully define the surface polariton dispersion curve in order to obtain correct results. This calculation includes the fact that, in addition to the well known dissipation process, surface polaritons may lose energy by coupling to the other diffracted orders.
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