We examine interference effects resulting from the superposition of photon-density waves produced by coherently modulated light incident upon a turbid medium. Photon-diffusion theory is used to derive expressions for the ac magnitude and phase of the aggregate diffusive wave produced in full- and half-space volumes by two sources. Using a frequency-domain spectrometer operating at 410 MHz, we verify interference patterns predicted by the model in scattering samples having optical properties similar to those of skin tissue. Potential imaging applications of interfering diffusive waves are discussed in the context of the theoretical and experimental results.
© 1992 Optical Society of America
Original Manuscript: December 6, 1991
Revised Manuscript: April 21, 1992
Manuscript Accepted: May 6, 1992
Published: October 1, 1992
J. M. Schmitt, A. Knüttel, and J. R. Knutson, "Interference of diffusive light waves," J. Opt. Soc. Am. A 9, 1832-1843 (1992)