Open Access
Table 2
Summary for thin Au films of changing nanostructure and refractive index behaviour.
| Thickness (nm) | Film structure | Best fit model | Index behaviour | Max/Min n | Max/Min k |
|---|---|---|---|---|---|
| 2.8 | • Small nanoparticles, around 40 nm size. | • Modified Drude and Forouhi-Bloomer | • Oscillations in n, sharp increase in k up to 510 nm before falling again. | 4.23/2.42 | 2.80/0.72 |
| 15 | • Nanoparticles begin to coalesce into uniform film. | • Modified Drude and Forouhi-Bloomer | • n peaks at shorter wavelengths before slightly rising from around 580 nm, k begins to approach bulk with slow rise from around 470 nm. | 1.61/0.75 | 4.17/1.58 |
| 41.3 | • Larger grains are seen within the film. | • Modified Drude and Forouhi-Bloomer | • n and k both very similar to bulk Au (to within 0.1 for n apart from below 400 nm; to within 0.2 for k). | 1.60/0.16 | 5.66/1.85 |
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