Figure 2. FDTD simulation results of the aluminum nano-void arrays.

(a) Typical AFM image of the 100 V aluminum nano-void structure and three-dimensional model of the nano-void structure with d being the diameter of the hemisphere. (b) Cross-sectional and planar views of the calculated radial EM field components of the 100 V aluminum nano-void structure (d = 217 nm); the inset in (b) shows the k-vector and polarization of the incident light. (c) Calculated local electromagnetic field intensity of the nano-void arrays at different wavelengths for d = 75 nm, 125 nm, 175 nm, 225 nm, and 275 nm, respectively.