Figure 4.

(a) Enhancement measure for emission in 300–420 nm at various distances (s = 1–20 nm) from the surface of a d = 80 nm aluminum nanoparticle. Three dipole orientations are considered, as in the caption for Figure 3. (b) Enhancement measure for a dipole located in the middle of an 80 nm aluminum nanoparticle dimer with various surface-surface particle spacings (2s = 2–40 nm). Inset: Radiated power enhancement of a perpendicularly oriented dipoledimer system with 2s = 4 nm.