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Metasurfaces are the two-dimensional version of metamaterials

Автор дискуссии: jayjoe1010   Начато: 12-15-2016, Ч:мм   Ответов: 0
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  •  12-15-2016, Ч:мм 1279

    Metasurfaces are the two-dimensional version of metamaterials

    In 2014, University of Utah engineering mentor Ajay Nahata and his mates demonstrated an inkjet printer could fabricate metasurfaces, or horizontal arrays of plasmonic resonators. Metasurfaces are the two-dimensional version of metamaterials, and metasurfaces for optical holography are usually made of gold and silver. However, when the frequency of the impinging rays is in the terahertz region, graphene and other semiconductors can wrangle plasmons as well. Noble-metal plasmonic resonators require expensive, custom microfabrication techniques, while the lowly inkjet printer can lay BK7 window down printer with sufficient resolution-and with spatially varying electrical ktp crystal conductivity-to create subwavelength nanostructures. In new experiments, Nahata and his team printed dipole arrays, with dimensions in the few hundreds of microns, onto clear plastic substrates. The printed dipoles looked identical to the undressed eye, but contained varying proportions of silver and carbon inks. The researchers then measured the metasurfaces' answers to polarized rays at 0. 1, 0. 15 and 0. 3 THz. The team then embedded random grayscale “quick-response” (QR) codes-the familiar two-dimensional smartphone-readable designs-into the same pattern. Under monochromatic illumination, a simple rectangular-dipole metasurface could distinguish among nine different numbers of dull, while an array of prism harder patterns (cross-shaped resonators) could distinguish among 36 values. When caf2 the researchers designed a metasurface responsive to three different frequencies of light, with four distinct gray levels per station, they produced an encoded image with 64 possible colors per pixel.
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