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• W2005173952 abstract "Randomly adsorbing chemically synthesized silver nanocubes, each of which is the optical analogue of a grounded patch antenna, onto a nanoscale-thick polymer spacer layer on a gold film results in a metamaterial surface with a reflectance spectrum that can be tailored by varying the geometry. In many photonic applications ranging from sensors to energy-harvesting devices, a perfectly absorbing material is desired. Previously, perfect absorbers of infrared or visible light have been made by using lithography to create patterned structures on metallic surfaces, but this approach is expensive and difficult to scale up. Antoine Moreau et al. have developed an attractively simple method, in which silver nanocubes produced by wet chemistry are randomly distributed across a polymer-coated gold surface. Each cube acts as a nanoantenna to counter the reflectance of the metal surface. These cubes are simple and cheap to produce and can be easily spread and attached to the surface, so that large areas can be covered. They provide a means of controlling the colour of the reflected light, and the efficient optical response of the cubes suggests that mixed cube populations with controlled sized dispersion could be used to adjust the absorption at will. Efficient and tunable absorption is essential for a variety of applications, such as designing controlled-emissivity surfaces for thermophotovoltaic devices1, tailoring an infrared spectrum for controlled thermal dissipation2 and producing detector elements for imaging3. Metamaterials based on metallic elements are particularly efficient as absorbing media, because both the electrical and the magnetic properties of a metamaterial can be tuned by structured design4. So far, metamaterial absorbers in the infrared or visible range have been fabricated using lithographically patterned metallic structures2,5,6,7,8,9, making them inherently difficult to produce over large areas and hence reducing their applicability. Here we demonstrate a simple method to create a metamaterial absorber by randomly adsorbing chemically synthesized silver nanocubes onto a nanoscale-thick polymer spacer layer on a gold film, making no effort to control the spatial arrangement of the cubes on the film. We show that the film-coupled nanocubes provide a reflectance spectrum that can be tailored by varying the geometry (the size of the cubes and/or the thickness of the spacer). Each nanocube is the optical analogue of a grounded patch antenna, with a nearly identical local field structure that is modified by the plasmonic response of the metal’s dielectric function, and with an anomalously large absorption efficiency that can be partly attributed to an interferometric effect10. The absorptivity of large surface areas can be controlled using this method, at scales out of reach of lithographic approaches (such as electron-beam lithography) that are otherwise required to manipulate matter on the nanoscale." @default.
• W2005173952 created "2016-06-24" @default.
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• W2005173952 date "2012-12-01" @default.
• W2005173952 modified "2023-10-17" @default.
• W2005173952 title "Controlled-reflectance surfaces with film-coupled colloidal nanoantennas" @default.
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• W2005173952 doi "https://doi.org/10.1038/nature11615" @default.
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