Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2005-08-22
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
10 pages, 10 figures
Scientific paper
Constructive interference among coherent waves traveling time-reversed paths in a random medium gives rise to the enhancement of light scattering observed in directions close to backscattering. This phenomenon is known as enhanced backscattering (EBS). According to diffusion theory, the angular width of an EBS cone is proportional to the ratio of the wavelength of light $\lambda$ to the transport mean free path length ls* of a random medium. In biological media, large ls* ~ 0.5-2 mm >> $\lambda$ results in an extremely small (~0.001 $^\degree$) angular width of the EBS cone making the experimental observation of such narrow peaks difficult. Recently, the feasibility of observing EBS under low spatial coherence illumination (spatial coherence length Lsc<
Backman Vadim
Kim Young L.
Li Xu
Liu Yang
Pradhan Prabhakar
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