Figure 3
From: Electric field enhancement and far-field radiation pattern of the nanoantenna with concentric rings
Near-field intensities for the structures with and without the concentric rings. (a) The cross-section view and (b) the top view of the electric field distribution of DESR structure at λ = 880 nm and (c) the cross-section view and (d) the top view of the electric field distribution of DESR structure with concentric rings at λ = 880 nm. The white lines are stream lines of the Poynting vectors. The scale bars are in logarithmic scale and limited to 0 to 3. The maximum field intensity of (a), (b), (c), and (d) are 103.37, 102.94, 104.50, and 104.08 times of the incident light intensity. The illuminated light is the plane wave propagated from the top to bottom; i.e., in - z direction.