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 $\mathrm{Im}(m)$. Over the range of $\mathrm{\Delta }\mathrm{Im}(m)=0.05$, the dependence can be satisfactorily described with a cubic polynomial function, whose determination requires exact computations at four different values of $\mathrm{Im}(m)$. The light-scattering characteristics at other intermediate values of $\mathrm{Im}(m)$ can be inferred with great accuracy via interpolation.

© 2018 Optical Society of America

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