Slight roughness schematic representation

Since for photons k = co/c, f" (0) should vary with the frequency roughly as l/oa Fig. 1 shows that the dispersion of f" (0) is slightly more complicated as ionization of p and d electrons will give rise to additional abrupt changes of f In fact the schematic representation of the absorption edge in Fig. 1 has to be replaced by a more structmred dispersion profiles at higher frequency resolution, as is shown in Fig. 2. 

Fig. 3 Schematic representation of a slight (a) and a strong (b) roughness. The profile of slight roughness is described hy the fimction z = L is the effective thickness of the porous film that represents strong roughness. (From [27])...

Fig. 6 Schematic representation of multiscale roughness. This structure is a combination of a slight and a strong roughness shown in Fig. 3a,b. (From [27])...

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