New metamaterials can be fabricated in multiple layers to form complex, three-dimensional meta-atoms that reflect more light than shiny gold surfaces, usually considered the ultimate in infrared reflectivity. The III-V materials also emit photons when excited – something that silicon, which can reflect, transmit and absorb – can’t do.
from Engineering and Construction News – ScienceDaily https://www.sciencedaily.com/releases/2017/03/170309132259.htm
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