Abstract
Diffuse photon density waves are just beginning to receive attention as a result of intrinsic interest in their phenomenology, and because of their propensity to provide information about the dense random media through which they propagate,1 such as human tissue and organs. Briefly, diffuse photon density waves are scalar, overdamped, traveling waves of light energy density. They will propagate through any medium in which the transport of light energy density is governed by the diffusion equation. These traveling waves are brought about by introducing an amplitude-modulated source into a turbid medium. This produces a macroscopic ripple of brightness that is microscopically composed of photons undergoing a random walk. The wavelength of the disturbance corresponds to the root-mean-square distance traveled by a photon during a modulation period, and can therefore be altered by changing the modulation frequency or D.
© 1993 Optical Society of America
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