Cooperation with research institutes

QNLs are a material layer consisting of thin (<3nm) layers of alternating materials. As the thickness of these layers is so much smaller than the wavelength of the light, the layer stack behaves optically like a single layer. The refractive index and band edge of the QNL can be adjusted by the thickness of the individual layers. A low-refractive material acts as a barrier and a high-refractive material as a quantum well, the thickness of which can be used to adjust the band edge. The ratio of the two materials determines the refractive index of the QNL. With the low thicknesses within the QNL, many material changes are necessary. In a conventional IBS system, these are linked to several mechanical movement systems and a step is also required to clean the target surface for zone targets. These processes take time, which adds up considerably with the complex layer designs required. It is therefore not possible to produce QNLs economically with such a system. The system concept implemented for HYpO therefore dispenses with mechanical movement and ensures spatial separation of the targets. Changing the coating material is made possible by the use of two sources; the ion beam is only active from one source at a time. The system can therefore switch between materials quickly and effectively. The coating of optical designs is also supported here with broadband optical monitoring.