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In particular, the researchers made a square absorber 60 mm on each side. They covered the absorber with a mosaic of dielectric materials, forming a grid of 16 tiles. Each tile was of a different thickness – and thus a different color. Each tile, which could be made as small as one millimeter on each side, acts like a pixel on the absorber.
Using this methodology, an absorber with up to a thousand of these pixel-like color units – which would be virtually impossible with conventional absorbers – can be built and form almost any pattern you want, Wang said. For example, you could make a camouflage pattern, which would be useful for making solar thermal devices for the military.
While the technology isn't market-ready yet, he said that with enough industry investment, the methods could be commercialized in the near future.
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The new absorber is covered with multiple layers of transparent dielectric materials, which can reflect light of a particular color. By changing the thickness of these layers, the researchers can tune the absorber to reflect light of almost any shade required. Some parts of the absorbing layer can be covered with a thicker transparent dielectric layer than other parts, allowing the researchers to create a single absorber with a rainbow of hues. And, it works almost as well as the best conventional ones.
