Figure 6
From: Electric field enhancement and far-field radiation pattern of the nanoantenna with concentric rings
Near-field intensities and far-field radiation patterns with H = 20 nm. Near-field intensities and far-field radiation patterns for the structure with dielectric layer thickness 20 nm at λ = 671 nm. (a) The cross-section view and (b) the top view of the electric field distribution of DESR structure at λ = 671 nm and H = 20 nm in Figure 5. The scale bars are in logarithmic scale and limited to 0 to 3. The maximum field intensity of (a) and (b) are 104.30, 104.56, times of the incident light intensity. The illuminated light is the plane wave propagated from the top to bottom; i.e., in - z direction. (c) The corresponding far-field radiation pattern which is excited by placing an x-polarized electric dipole source at the feed gap of the dipole antenna.