Colors of transparent submicron suspensions on approaching the Rayleigh regime |
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Authors: | Magatti Davide Ferri Fabio Ragazzi Paolo Pigazzini Marta C Averchi Alessandro Di Trapani Paolo |
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Affiliation: | Light in Light Srl, Como, Italy. |
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Abstract: | The features of scattered and transmitted light by dilute suspensions of transparent submicron particles are investigated both in the spectral and in the perceived colorimetric domains, as a function of effective particle diameter D, particle-host refractive-index mismatch m, and scattering angle θ. Our results show that the wavelength λ-dependence of the scattering and extinction cross sections remains quite similar well beyond the Rayleigh regime up to particle sizes of a few hundreds nm, but only for specific scattering angles that depend on D and m, and tend to 90° on approaching the Rayleigh regime. Close to this limit (D/λ<1), a simple criterion that relates the perceived scattering color at θ=90° and the ratio of the sample extinction coefficients at two properly selected wavelengths is demonstrated. A comparison between computed and measured data is presented. |
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