Effect of the Photon's Brownian Doppler Shift on the Weak-Localization Coherent-Backscattering Cone

Details Effect of the Photon's Brownian Doppler Shift on the Weak-Localization Coherent-Backscattering Cone Effect of the Photon's Brownian Doppler Shift on the Weak-Localization Coherent-Backscattering Cone

2008-04-14

arxiv.org/abs/0804.2129v1

Physical Review Letters 97, 3 (2006) 033901

Physics

Optics

Scientific paper

10.1103/PhysRevLett.97.033901

We report the first observation of the dependence of the coherent-backscattering (CBS) enhanced cone with the frequency of the backscattered photon. The experiment is performed on a diffusing liquid suspension and the Doppler broadening of light is induced by the Brownian motion of the scatterers. Heterodyne detection on a CCD camera is used to measure the complex field (i.e., the hologram) of the light that is backscattered at a given frequency. The analysis of the holograms yield the frequency and the propagation direction of the backscattered photons. We observe that the angular CBS cone becomes more narrow in the tail of the Brownian spectrum. The experimental results are in good agreement with a simple theoretical model.

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