title: Template-assisted colloidal self-assembly of macroscopic magnetic metasurfaces.
abstract: We demonstrate a template-assisted colloidal self-assembly approach for magnetic metasurfaces on macroscopic areas. The choice of anisotropic colloidal particle geometry, assembly pattern and metallic film is based on rational design criteria, taking advantage of mirror-charge effects for gold nanorods placed on gold film. Monodisperse gold nanorods prepared utilizing wet-chemistry are arranged with high precision on wrinkled templates to form linear array-type assemblies and subsequently transferred to a thin gold film. Due to the obtained particle-to-film distance of 1.1 nm, the plasmonic mode of the nanorod is able to couple efficiently with the supporting metallic film, giving rise to a magnetic mode in the visible spectrum (721 nm). Conventional UV-vis-NIR measurements in close correlation with electromagnetic simulations provide evidence for the presence of a magnetic resonance on the macroscopic area. The herein presented scalable lithography-free fabrication process paves the road towards colloidal functional metasurfaces with an optical response in the effective magnetic permeability.
authors.affiliation: Leibniz-Institut für Polymerforschung Dresden e.V., Institute of Physical Chemistry and Polymer Physics, Hohe Str. 6, 01069 Dresden, Germany. koenig@ipfdd.de fery@ipfdd.de.
authors.forename: Martin
authors.initials: M
authors.lastname: Mayer
authors.forename: Moritz
authors.initials: M
authors.lastname: Tebbe
authors.forename: Christian
authors.initials: C
authors.lastname: Kuttner
authors.forename: Max J
authors.initials: MJ
authors.lastname: Schnepf
authors.forename: Tobias A F
authors.initials: TA
authors.lastname: König
authors.forename: Andreas
authors.initials: A
authors.lastname: Fery