Explicit determination of the complex refractive index of an absorbing medium from reflectance measurements at and near normal incidence

Abstract

Measurement of reflectance at normal incidence $\mathcal{\text{R}}$ and its fractional change $\mathrm{\Delta }\mathcal{\text{R}}/\mathcal{\text{R}}$ caused by a change of the angle of incidence from 0 to a small angle ϕ (ϕ ≲ 20°) permits explicit determination of both the refractive index n and extinction coefficient k of an isotropic absorbing medium. The medium of incidence (ambient) is assumed to have a known refractive index (e.g., =1 for vacuum or air), and the incident light is either p or s linearly polarized.

© 1982 Optical Society of America

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