Figure 5
FEM-simulated field and charge distribution. Near-field electric intensity and induced charge distribution of (a) the periodic inverted pyramidal nanovoid, (b) combined nanostructure, (f) horizontally placed silver nanoparticle dimer, (g) obliquely placed dimer, (h) single silver nanosphere, (i) silver nanosphere, and nanorod. The tilt angles of silver dimer in b and g are the same. c is enlarged from b. d and e display induced charge density distribution on the surface of the nanovoid right side wall, corresponding to nanovoids shown in a and b, respectively.