Abstract

The reflectance and transmittance of light normally incident on a transparent, weakly inhomogeneous dielectric plate have been found in zeroth-, first-, and second-order perturbation theory. The resulting analytical expressions are general and can be applied to arbitrary one-dimensional permittivity profiles of the plate. The reflectances calculated by perturbation theory for a structure consisting of several isotropic layers whose refractive indices differ only slightly are compared with their exact values.

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