Wavelength dependence of light propagation in a water suspension of anisotropic scatterers

We experimentally study the wavelength dependence of light propagation in a water suspension of lithium niobate microcrystalline particles. First, the ballistic transmission in the visible range of the suspension is measured. The nonlinear relationship is observed between the transport mean free path and the wavelength of the incident light. Secondly, we measure the coherent backscattering (CBS) of the sample at different wavelengths. The full width at half maximum of the CBS cone at 532 nm is about 1.24 times as large as that at 671 nm. The results indicate that the light with a long wavelength propagates further than the short wavelength light and the localization state of the short one is stronger. Finally, we investigate the light-controllable CBS experiments in the disordered materials of anisotropic scatterers, which show that the configuration of pump light with the longer wavelength and the probe light with the shorter wavelength performs better.