Extraordinary optical transmission through a conducting film with a nanometric inhomogeneity in the evanescent wave region

Mathematical simulation is used to establish that extraordinary light transmission through a conducting film arises in hole and other nanometric homogeneities in the evanescent wave region is present in metallic films. This effect increases at the wavelengths for maximal scattering cross section domain. The problem of scattering a plane wave by the particle in the film is formulated for the scattered field. The results show that the thickness of the inhomogeneity at the end faces of the film is 1 nm and that the computational error are 1%. It is seen that the scattering cross section decreases sharply after the critical angle of 41.2° and that the diameter of inhomogeneity is about one-ninth of the wavelength in glass. The scattering cross section and the amplitude of a plane wave reflected from the upper edge of the film increase consistently, causing extraordinary light transmission through the film with nanoscale inhomogeneity in evanescent wave region.