DISTRIBUTION OF CURRENT-INDUCED ON METAL-STRIP GRATINGS BY PLANE-WAVE

In this paper, we present a rigorous analysis of current distribution induced on a metal-strip grating by an incident plane wave. The metal strips of the grating are characterized by a complex permittivity, wit h a large imaginary part to account for their finite conductivity. Suc h a scattering problem is formulated by the mode-matching method to de termine the scattered fields everywhere, so that the volume distributi on of current within a metal strip can be explicitly obtained, Numeric al results are given to illustrate the effects of the dielectric const ant of the surrounding media, as well as the incident angle and polari zation on the current distribution induced by an incident plane wave. The air and metal modes form the basis for physical explanations of th e numerical results obtained.