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.
© 2001 Optical Society of America
(120.1840) Instrumentation, measurement, and metrology : Densitometers, reflectometers
(260.2030) Physical optics : Dispersion
(290.7050) Scattering : Turbid media
(300.6170) Spectroscopy : Spectra
Kai-Erik Peiponen, Anssi J. Jääskeläinen, Erik M. Vartiainen, Jukka Räty, Unto Tapper, Olivier Richard, Esko I. Kauppinen, and Kari Lumme, "Estimation of the Wavelength-Dependent Effective Refractive Index of Spherical Plastic Pigments in a Liquid Matrix," Appl. Opt. 40, 5482-5486 (2001)