Figure 3. FDTD simulation results.

FDTD simulations of the electric field distributions for ZnO-NTs decorated with Ag-NPs coupled with Au-NRs in a parallel alignment (a–f) and a perpendicular alignment (g–l). The incident polarization is in two different directions, (a,j) and (d,g) parallel and perpendicular to the nanorod. The |E/E₀|², the field enhancement normalized to the input field, for (b,e) and (h,k) a 2 nm gap with 10 nm Ag-NP and (c,f) and (i,l) a 2 nm gap with 20 nm Ag-NP is shown on a log-scale.