Interaction between surface plasmon and 2-dimensional nano-defects at metallic surfaces.*

A theoretical study of light diffraction and intensity of near field from two-dimensional nano-defects at metallic surface illuminated with electromagnetic plane waves is presented. Results for one or two Gaussian-shaped sub-wavelength defects at silver surface are shown. The light diffraction patterns shown minima at specific angular directions in the case of two defects separated a distance $a_{x}$. These minima are associated to the ration (\textit{$\lambda $}/2$a_{x})$ and depend on the localization of the defects, being \textit{$\lambda $} the wavelength of the illumination light. The Near-Field intensity, calculated to constant height, shown oscillations associated to the excitation of surface plasmon, which amplitude are grater for smaller width of the Gaussian defect.