State of polarization of light scattered by anisotropic spherical particles.

概要

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Using the light-scattering theory of Rayleigh–Gans, theoretical expressions were derived for the state of the polarization of light scattered by anisotropic spherical particles in the case of linearly polarized incident light with its electric vector inclined by an angle ψ to the scattering plane. The azimuth angle of the ellipse of the light scattered is a function of only the scattering angles, θ and ψ; the ellipticity of the ellipse of the scattered light is always equal to zero, meaning that the scattered light is linearly polarized for linearly polarized incident light. The degree of polarization of the scattered light, P, defined as the ratio of the polarized component to the total intensity of the scattered light, depends on the intrinsic anisotropy, pm, the relative refractive index of the sphere to the solvent, m, and θ together with the angle ψ. Although P for isotropic spherical particles is always equal to 1 at any θ, P for anisotropic spherical particles is smaller than 1.0, but close to 1.0 if the incident light is unpolarized or linearly polarized with ψ=30°. If ψ is smaller than 30°, P varies from 1.0 to 0, depending strongly on the pm and m of the anisotropic sphere. It has been suggested that the determination of P as a function of ψ and θ would provide good information about the optical intrinsic anisotropy of anisotropic spherical particles.
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