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Figure 8


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Comparison of the determined refractive indices n (left) and k (right) for Au layers between 1.5 and 10 nm thickness. Strongly-varying index behaviour is seen. For the thinnest layer (1.5 nm), the refractive index n appears very low, increasing for slightly thicker layers (2.8 nm and 5.3 nm) before decreasing again for a 10 nm thick layer. The shape of k appears to “flip”, from being strongly absorbing at shorter wavelengths for the 1.5 nm thick layer, to strongly absorbing at longer wavelengths for the thicker layers (in line with the behaviour of bulk Au).

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