Fig. 7.

( Media 2 ^{(3.7MB, MOV)} ) Simulation of light back-propagated through a scattering medium to a narrow peak. The scattering medium consists of 1600 randomly positioned, 6-μm-diameter dielectric (n = 1.2) cylinders. A 4-μm-wide plane-wave light source (wavelength λ) is embedded at the center of the scattering medium. From top to bottom: (a) λ = 1 μm, (b) λ = 4 μm, (c) λ = 16 μm, (d) λ = 64 μm, (e) λ = 256 μm, respectively. In each subplot, the forward propagation light profile (gray dashed line) is compared to the back-propagated light (blue line) and the back-propagated light with a soft sink to eliminate the outgoing light component (black line). A zoomed-in view is shown in each inset-figure. Before eliminating the outgoing field component the root-mean-square error is: (a) 9.5%, (b) 4.97%, (c) 15.5%, (d) 29.5%, and, (e) 46.7%, respectively; after eliminating the outgoing light component, the root-mean-square error is: (a) 3.05%, (b) 0.58%, (c) 0.40%, (d) 0.24%, and, (e) 0.19%, respectively. The peak width at FWHM is: (a) 1.7 μm, (b) 3.0 μm, (c) 4.1μm, (d) 3.7 μm, (e) 3.0 μm, respectively. It is clear that the peak width of the forward light and back-propagated light profiles are identical.