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Phys Rev Lett. 2005 Sep 30;95(14):143903. Epub 2005 Sep 29.

Observation of phase conjugation of light arising from enhanced backscattering in a random medium.

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  • 1Department of Physics, Duke University, Durham, North Carolina 27708, USA.


We measure the fundamental phase conjugation of a light field arising from enhanced backscattering in a multiple scattering medium. The measurements employ a two-window, time-resolved heterodyne method to suppress specularly reflected light and to determine the transverse Wigner function of the field, yielding joint amplitude and phase information. Using this method, a light field backscattered from an aqueous suspension of polystyrene spheres is found to reverse curvature relative to that of the incident field.

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