Controlling the Colour of Metals: Intaglio and Bas-Relief Metamaterials

Details Controlling the Colour of Metals: Intaglio and Bas-Relief Metamaterials Controlling the Colour of Metals: Intaglio and Bas-Relief Metamaterials

2010-11-09

arxiv.org/abs/1011.1977v1

Opt. Exp. 19, 23279 (2011)

Physics

Optics

Scientific paper

10.1364/OE.19.023279

The fabrication of indented ('intaglio') or raised ('bas-relief') sub-wavelength metamaterial patterns on a metal surface provides a mechanism for changing and controlling the colour of the metal without employing any form of chemical surface modification, thin-film coating or diffraction effects. We show that a broad range of colours can be achieved by varying the structural parameters of metamaterial designs to tune absorption resonances. This novel approach to the 'structural colouring' of pure metals offers great versatility and scalability for both aesthetic (e.g. jewellery design) and functional (e.g. sensors, optical modulators) applications. We focus here on visible colour but the concept can equally be applied to the engineering of metallic spectral response in other electromagnetic domains.

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