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Table 1

Summary for thin Ag films of changing nanostructure and refractive index behaviour.

Thickness (nm) Film structure Best fit model Index behaviour Max/Min n Max/Min k
1.1 • Small nanoparticles, around 37 nm size. • Modified Drude and Lorentz • Sharp peak in both n and k at around 470 nm/415 nm, respectively. 5.33/1.82 3.59/0.23
7 • Larger nanoparticles, around 56 nm size. • Modified Drude and Lorentz • Smaller, broader peak followed by plateau in both n and k. 3.67/0.94 2.82/0.36
11 • Nanoparticles begin to coalesce into uniform film. • Modified Drude and Lorentz or Forouhi-Bloomer n plateaus around 470 nm, k has a slight peak at 425 nm. 3.11/0.73 2.57/0.8
14 • Film shows formation of small grains. • Modified Drude and Forouhi-Bloomer. n plateaus around 470 nm, k almost flat. 2.04/0.94 2.32/1.94
50 • Grain size increases. • Modified Drude and Forouhi-Bloomer. • n flat, k increasing over wavelength range; both within 0.1 of bulk Ag. 0.13/0.06 5.30/1.41

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