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Template-assisted colloidal self-assembly of macroscopic magnetic metasurfaces

Reference

Martin Mayer, Moritz Tebbe, Christian Kuttner, Max J. Schnepf, Tobias A. F. Konig, Andreas Fery, "Template-assisted colloidal self-assembly of macroscopic magnetic metasurfaces" , In Faraday Discuss., The Royal Society of Chemistry, vol. 191, pp. 159-176, 2016. [doi]

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.

Bibtex

@Article{C6FD00013D,
author ="Mayer, Martin and Tebbe, Moritz and Kuttner, Christian and Schnepf, Max J. and Konig, Tobias A. F. and Fery, Andreas",
title ="Template-assisted colloidal self-assembly of macroscopic magnetic metasurfaces",
journal ="Faraday Discuss.",
year ="2016",
volume ="191",
issue ="0",
pages ="159-176",
publisher ="The Royal Society of Chemistry",
doi ="10.1039/C6FD00013D",
url ="http://dx.doi.org/10.1039/C6FD00013D",
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."}

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