Open Access
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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