Thin diamond-like photonic nanostructures strongly reflect a surprisingly broad range of colours in all directions, whatever the angle of incident light. This is the new finding from physicists and mathematicians at the University of Twente in The Netherlands who have studied the reflectivity of cubic diamond-like “inverse woodpile” crystals using numerical calculations. The structures, based on silicon, show great promise as back reflectors for solar cells and could also be used to make tiny on-chip light sources and lasers, “invisibility cloaks” and non-linear devices for ultrafast all-optical switching………
http://nanotechweb.org/cws/article/tech/68640
