What is the exact path of light inside a highly scattering material like white paint? This is a question that is impossible to answer, as the particles inside the paint are distributed randomly. This, at the same time, is a very attractive property for applying photonics in non-hackable security applications. Still, you would like to have a look inside to see what is happening. For this reason, researchers of the University of Twente (MESA+ Institute), built a light-scattering microcube that is both random and controlled. Contradictory as it seems, this is a way to know exactly what is happening inside. The research results are in Advanced Optical Materials.
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Source: Phys.org