Less than one millimeter thick, the sheet absorbs approximately 94 percent of the infrared light it encounters. Trapping so much light means that warm objects beneath the cloaking material become almost completely invisible to infrared detectors.
Importantly, the stealth material can strongly absorb light in the so-called mid- and long-wavelength infrared range, the type of light emitted by objects at approximately human body temperature.
To trap infrared light, Jiang and colleagues turned to a unique material called black silicon, which is commonly incorporated into solar cells
https://www.sciencedaily.com/
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