Second-order optical nonlinear material

Second-order optical nonlinear material arranged on a substrate, wherein the second-order optical nonlinear material comprises at least two different materials arranged in layers on the substrate. The layers are arranged on each other in a predetermined order based on the type of material and/or orientation of the layer. The predetermined order is chosen so that the layers of the at least two different materials possess no macroscopic centrosymmetry with respect to their material and/or orientation.