Recent Examples on the WebThey are made of methacrylate, the same material which is used to protect supermarket workers from customers.
Fox News, 8 May 2020 As described July 20 on the physics preprint website arXiv, their metamaterial consisted of a plastic called polymethyl methacrylate embedded in a grid upon gold film.
Brandon Keim, WIRED, 28 July 2011
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