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‘Darker than black’ metamaterial promises better solar cells

 

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Ordinary black paint absorbs about 85 per cent of the light that hits it. So making something look black simply means ensuring that it absorbs at least as much as this.

Now Evgenii Narimanov at Purdue University and a few colleagues have worked out that they can do much better using a substance called a hyperbolic metamaterial, which absorbs and traps most kinds of light within its structure. via technology review

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