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 (Dλ ≪ 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.

Colors of transparent submicron suspensions on approaching the Rayleigh regime

FERRI, FABIO;RAGAZZI, PAOLO;PIGAZZINI, MARTA CECILIA;DI TRAPANI, PAOLO
2012-01-01

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 (Dλ ≪ 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.
2012
SCATTERING; LIGHT; SKY
Magatti, D.; Ferri, Fabio; Ragazzi, Paolo; Pigazzini, MARTA CECILIA; Averchi, A.; DI TRAPANI, Paolo
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11383/1791316
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