Theory of a metal-semiconductor photodiode with grating coupling of the incident light to surface plasma waves

A theoretical model has been developed to design a metal-semiconductor (Schottky barrier) narrow-band photodiode with grating coupling of the incident light to surface plasma waves. With optimal choice of grating parameters and the right combination of materials, the quantum efficiency can be increased over the flat surface geometry. The results of this model are in good agreement with the experimental results found in the literature.