Light propagating in a layer of scattering nanoparticles, shows the principle of diffusion – like tea particles in hot water. The deeper light is penetrating into the layer, the lower the energy density. Scientists of University of Twente’s Complex Photonics Group, however, manage to turn this falling diffusion curve into a rising one, by manipulating the incident light. More light energy inside an opaque layer, is the result, which could lead to solar cells or LED’s with better yields. The results are published in New Journal of Physics.