Abstract

The geometrical theory of free-space radiative energy transfer is extended to the case of refracting media. For a smoothly varying refractive index the cross-spectral density of the field is expressed in terms of a generalized specific intensity that satisfies a transport equation along refracted rays. If the generalized specific intensity varies slowlyover distances of the order of a wavelength, its value along a refracted ray varies as the square of the local refractive index.

© 1992 Optical Society of America

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