This pool of expertise is part of the Department of Materials. It supplies samples for national and international collaborations or projects. In particular, epitaxy is strongly involved in device activities including lasers and detectors for telecommunications, all-optical devices, transistors. Other important topics where epitaxy has a significant role are: spintronic, 2D electron gas, physics of nanostructures, photonic crystals, microcavities, functional oxides, hybrid materials...