Physics – Optics
Scientific paper
1997-08-07
Phys. Rev. A 56, 4216 (1997)
Physics
Optics
27 pages RevTeX with 11 figures included with psfig
Scientific paper
10.1103/PhysRevA.56.4216
This is a theoretical study of the interplay of optical phase-conjugation and multiple scattering. We calculate the intensity of light reflected by a phase-conjugating mirror when it is placed behind a disordered medium. We compare the results of a fully phase-coherent theory with those from the theory of radiative transfer. Both methods are equivalent if the dwell time \tau_{dwell} of a photon in the disordered medium is much larger than the inverse of the frequency shift 2\Delta\omega acquired at the phase-conjugating mirror. When \tau_{dwell} \Delta\omega < 1, in contrast, phase coherence drastically affects the reflected intensity. In particular, a minimum in the dependence of the reflectance on the disorder strength disappears when \Delta\omega is reduced below 1/\tau_{dwell}. The analogies and differences with Andreev reflection of electrons at the interface between a normal metal and a superconductor are discussed.
Beenakker C. W. J.
Brouwer Piet. W.
de Jong J. M. M.
Paasschens J. C. J.
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