Summary

We have obtained an approximate computational model for light scattering by a 2-dimensional thin dielectric flake by applying a solution for scattering by an impedance wedge to the edges of the flake and adding the transmitted diffracted field acquired using Babinet's principle and Fresnel's equations. Results from our model have been shown to agree well with microwave test measurements. Analog microwave measurements simulating the light scattering by a silicate flake averaged over random orientation, show over all blue color, as well as blue polarimetric color at scattering angles smaller than 90 degrees. Blue color is thus not necessarily an indication of very small particles but can also indicate flakes. We suggest that it could be possible to use polarimetric color data to distinguish these two types of particle geometries. By looking at subsets of the measurements, it was shown that aligned flakes and flakes which are arbitrarily orientated, can show very different light scattering characteristics.

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