Comparison of resonance optical scattering of plane waves by infinite gratings of silver cylinders and strips

Periodic structures possess a specific feature, there is a set of high quality resonances near to the wavelength equal to the grating period and their Q-factors rise higher if the grating becomes sparser. Making a grating from silver elements brings other resonances - surface-plasmon ones appearing in the visible-light band. We investigate interaction between the grating and the plasmon resonances in the scattering and absorption by infinite gratings of silver circular cylinders and silver thin strips, for the E and H-polarization cases.