Figure 4.

Optical properties and figures-of-merit for our metallic films of Al (black), Cu (red), Au (green), and Ag (blue). The films were deposited as described in Figure 2. Solid lines are for measured values for the template-stripped recipe films and dashed lines are from Palik²³ (Cu, Au, and Ag) and Rakić²⁴ (Al). (a) and (b) show the real and imaginary part of the dielectric function, respectively. (c) and (d) plot calculated quality factors²⁶ for the localized surface plasmon resonance in spherical structures (Q_LSPR) and surface plasmon polaritons (Q_SPP), respectively. The data for the films were smoothed with a five-point moving average.