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Figure 7

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Comparison of the determined refractive indices n (left) and k (right) for Au layers from 10 to 41 nm thickness. The 10 nm layer has behaviour markedly different from that of bulk gold. However, as the thickness increases, the refractive index in n and k rapidly converges towards that of the bulk material, reaching an index within 0.2 of that reported in literature for a layer of just 22 nm thickness. *: bulk data taken from the Sopra SA database, currently available at [35].

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