Figure 4From: Electric field enhancement and far-field radiation pattern of the nanoantenna with concentric ringsFar-field radiation patterns for the structures with and without the concentric rings. (a) The DERS structure and (b) the structure with concentric rings at λ = 880 nm. The radiation pattern is calculated from the simulations by placing an x-polarized electric dipole source at the feed gap of the dipole antenna.Back to article page