Figure 2

Real part of the effective dielectric function for the Au-, Cu- and Ag-based MDNs. The real part of the effective dielectric function ϵ_eff(ω) for the Au-, Cu- and Ag-based MDNs is calculated using Johnson and Christy [16] data and Equation 3 at ϵ_d = 3.42 at g = 0.1.