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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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