Electrodynamic analysis of circular nanoarrays

The boundary problem of electromagnetic wave diffraction on two-dimensional periodic metal gratings has been solved with finite permittivity of a metal in the optic range. The suggested electrodynamic model is based on the method of approximate boundary conditions for thin dielectric layers. It was found that the dependence of scattered field magnitude on a wavelength was of resonant character, with the possibility of resonant wavelength being much greater than grating cells. It is shown that the grating with high reflection coefficient at frequencies of plasmon resonance can be designed.