The optical properties of aggregated noble metal films have been studied in the spectral range from 0.35 to 1.0 μm. From the measurements of reflectance and transmittance, the effective optical constants were derived. These constants were then compared to those given by a model considering the films as formed by small rotational ellipsoids. In the model, the dipole/dipole interactions between particles have been taken into account together with the influence of the substrate. Careful measurements of film structures have shown that the assumptions concerning the size and shape of particles are reasonable. When p-polarized incident light is used, the resonance wavelength observed in the visible for the noble metal films is shifted to shorter wavelengths as the angle of incidence is increased.
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Truong et al. (1977) studied this question.