Interpolating light-scattering properties of irregularly shaped, absorbing particles

Optics Letters
Evgenij ZubkoYuriy Shkuratov

Abstract

Success in developing remote-sensing methods is largely based on adequate modeling of target-particle shapes. In various terrestrial and cosmic applications, submicrometer- and micrometer-sized dust particles appear to have a highly irregular morphology. Light scattering by such irregularly shaped particles can be computed only with a numerical technique that, in practice, is a time-consuming approach, demanding significant computational resources. In this Letter, we discuss an efficient way to accelerate light-scattering computations through interpolation of the numerical results obtained at different levels of material absorption. We find a nonlinear dependence of reflectance, degree of linear polarization, and linear and circular polarization ratios on the imaginary part of refractive index Im(m). Over the range of ΔIm(m)=0.05, the dependence can be satisfactorily described with a cubic polynomial function, whose determination requires exact computations at four different values of Im(m). The light-scattering characteristics at other intermediate values of Im(m) can be inferred with great accuracy via interpolation.

References

Oct 1, 2007·Optics Express·Michael I MishchenkoJoop W Hovenier
Mar 12, 2010·Applied Optics·Evgenij ZubkoGorden Videen
Apr 2, 2015·Optics Letters·Evgenij Zubko

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