Journal
FARADAY DISCUSSIONS
Volume 191, Issue -, Pages 159-176Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6fd00013d
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Funding
- European Research Council [ERC-2012-StG 306686]
- Elite Network Bavaria within the framework of the Elite Study Program Macromolecular Science
- grant for PhD candidates according to Bavarian elite promotion act (BayEFG)
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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.
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