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Projekt Druckansicht

Metamaterialien in flüssiger Phase

Fachliche Zuordnung Experimentelle Physik der kondensierten Materie
Optik, Quantenoptik und Physik der Atome, Moleküle und Plasmen
Förderung Förderung von 2014 bis 2019
Projektkennung Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 243120259
 
Erstellungsjahr 2018

Zusammenfassung der Projektergebnisse

The goal of this project was to develop the basic understanding of the physics of optical metamaterials in a liquid phase and to realize first experimental demonstrations of such metaliquids. These metaliquids should consist of a large number of complexly shaped nanosized metaatoms, which are arranged with positional and orientational disorder in a liquid host matrix, to form a homogenizable and isotropic effective optical volume medium. To reach this goal we had to develop new methods for the theoretical description, technological realization, and experimental optical characterization of metaliquids, which all together allowed us to achieve considerable progress in this field. The newly developed theoretical methods take into account the complexity of the geometry of the metaatoms, which constitute the volume metaliquid, as well as their disordered arrangement. To this end, we established a method, which can handle a large number of metaatoms, the optical response of each being described by its scattering T matrix containing also the properties of higher order scattering moments. The entries of these T matrices are derived from rigorous solutions of Maxwell's equations for an individual metaatom. These methods allow to predict precisely and reliably the macroscopic optical properties of large volume metaliquids. The newly developed technological methods rely on the electron-beam-lithography-based fabrication of large numbers of metaatoms on a carrier substrate, which are subsequently released from the substrate and transformed into a suspension forming the final metaliquid. This process is based on our very efficient electron beam lithography tool, involving prepatterned cell-projection of large ensembles of metaatoms with unprecedented homogeneity. All processing steps of the transfer from the wafer into the final liquid have been developed successfully within the project and are now available for further studies. The newly developed experimental methods focused on the characterization of the optical properties of metaatoms at all critical steps of the technological realization of the metaliquids to study the physical processes of their interaction and the effective parameters of the resulting volume composite materials. This took into account farfield characterization methods to measure the spatial and angular dependence of the effective scattering properties on the carrier substrate as well as in the liquid phase. This allowed to uniquely determining the effects of positional and orientational disorder in the liquid phase. Furthermore new approaches for nearfield characterization of the metaatom's interaction in the liquid phase could be developed. By applying these new theoretical, technological, and experimental characterization methods, we could realize a first metaliquid and hence we could demonstrate the feasibility and perspective of our proposal. Along the work towards this demonstration, we have obtained deeper insight into the physics of disordered composite media, which we are currently employing in collaboration with industry partners in the framework of the European Union’s Horizon 2020 research and innovation program under a Marie Sklodowska-Curie grant.

Projektbezogene Publikationen (Auswahl)

 
 

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