Estimation of the wavelength-dependent effective refractive index of spherical plastic pigments in a liquid matrix.

Refractive-index data are important for the prediction of light scattering from spherical pigments. Reflectance from a slurry that contains plastic pigments was studied with the aid of a reflectometer. The effective refractive index of spherical plastic pigments in a slurry was determined by use of reflectance data and a phase-retrieval procedure based on the maximum-entropy method. This method provides a simple way to estimate the effective refractive index of pigments in a liquid matrix.

Comparison between the optical constants obtained by the Kramers-Kronig analysis and the maximum entropy method: infrared optical properties of orthorhombic sulfur.

The optical constants of orthorhombic sulfur computed by the Kramers-Kronig phase-shift analysis were recently reported by Fuller et al. The results obtained by Fuller et al. are compared with the ones obtained by a novel maximum entropy procedure.