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Figure 1 | Nanoscale Research Letters

Figure 1

From: Effect of the anodization voltage on the pore-widening rate of nanoporous anodic alumina

Figure 1

Sketch of the structure used to model the ellipsometric data. Left: schematic drawing of the NAA structure showing the pores, the alumina, and the aluminum substrate. Right: the corresponding layered optical model considered by the characterization software. P is the porosity of the NAA, which corresponds to the volume fraction of air. The plus sign represents the use of a Bruggeman effective medium approximation to model the refractive index of the mixture of materials in the layer.

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