Plasmon Media Technology

The ME write once disc developed by Plasmon Data Systems is differentiated from other optical discs by the use of a unique microstructure called Moth Eye on the disc surface. This surface structure takes its name from the fact that similar surfaces are found on the cornea of certain nocturnal insects including the night moth. The microstructure, which has a pitch significantly below the wavelength of light, acts as an impedance matching layer to reduce the surface reflection. The reduction in reflectivity can also be achieved in the case of metal and dielectric coatings on the ME surface and in this case the absorption of the film is increased.