Template-assisted colloidal self-assembly of macroscopic magnetic metasurfaces

• DOI: 10.1039/c6fd00013d
• Publication Date: 2016-02-22T13:30:35Z
• Authors: Martin Mayer; Moritz Tebbe; Christian Kuttner; Max J. Schnepf; Tobias A. F. König; Andreas Fery
• Keywords: Chemistry; 02 engineering and technology; 0210 nano-technology

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.