Mirror Technology - A Dielectric Omnidirectional Reflector

"Dielectric" mirrors, which reflect certain kinds of light (e.g. infrared) while allowing other, visible forms of light through, have already been used in scientific applications, though with one important defect: they can only reflect light from a certain angle. However, a new coating technology appears to have solved this problem, creating a truly omnidirectional, or "perfect" mirror, as explained in this paper.