Two types of optical resonances in the scattering of visible light by discrete metal nanowire scatterers with periodicity

We present the results of numerical simulation of the scattering and absorption of the H-polarized electromagnetic wave by several discrete scatterers made of silver nanowires in visible range. Using the Fourier expansions and addition theorems for cylindrical functions, we perform analytical regularization and obtain a block-type Fredholm second-kind matrix equation for the scattered-field expansion coefficients. This guarantees the convergence of numerical solution. Numerical results are presented of the analysis of far-field and near-field characteristics of the studied scatterers. It reveals the presence of the grating and the plasmon resonances in the far-field characteristics and specific near-field patterns in these resonances.