Nonlinear and nonlocal optical response in complex nanostructured multilayers (A05)

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The impact of localized effects at nanosized features on the optical response of a complex largescale structure is at the heart of this project. It extends classical methods to describe nonlinear properties of multilayered, ultrathin nanolaminates and other complex metamaterials, such as amorphous composites. A nonlinear theory for multilayered structures is developed from a semiclassical perspective. This includes non-classical electron interaction effects in metal components and additional scattering stemming from rough interfaces. Such complex systems enable a high tunability and amplification of nonlinearities through geo-metrical and material parameters and via local field enhancement phenomena, respectively. These finding support the projects B3|Szeghalmi/Tünnermann and B4|Nolte/Zeitner dealing with amorphous films and hybrid multilayers. With respect to a semiclassical description of electron dynamics, the project will strongly benefit from close collaboration with project A3|Busch/Peschel.