So far this device only works in two dimensions, on radar scans directed straight against its sides. The device could work in three dimensions with concentric spheres, rather than the rings used currently, Qiu noted.
In theory, ghost illusion devices that work in visible light can be created as well. However, every feature of the device would have to be shrunk to match visible light's smaller wavelengths. For instance, to work against a wavelength of visible light of about 600 nanometers or 600 billionths of a meter, one would need copper loops only 50 nanometers wide, about 2,000 times thinner than the average diameter of a human hair.
"The wavelength of light is not an issue, but fabrication is," Qiu said.
The scientists will detail their findings in a forthcoming issue of the journal Advanced Functional Materials.
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