Researchers from the university of Texas have an ‘invisibility cloak’ developed, relatively large, free-standing objects invisible. The used metamateriaal works as yet, however, not with visible light.
The researchers used a new type of metamateriaal to their test invisible. In the past, was used to artificial materials with a negative refractive index, electromagnetic waves around the object to be marshaled. That explains, however, restrictions on the size and shape of the concealing object.
The metamateriaal that the Austin-researchers bet would be that constraint, however, have not. They succeeded in a cylinder of 18 inches long invisible, but the shape of the object would become irrelevant. There was used plasmonisch metamateriaal. The radiation emitted by the metamateriaal is scattered, and the by the to conceal the object, the scattered radiation cancel each other out, making the object invisible seems. Unlike previous onzichtbaarheidsmaterialen, this effect is not dependent on the viewing angle.
The major drawback of the plasmonische material is, however, the wavelengths at which it works. The researchers were able to test object invisible at a frequency between 2.7 and 3.8 GHz microwave radiation with a frequency significantly below that of visible light. The Americans want their plasmonisch metamateriaal further develop so that with visible light works and objects to the human eye can absorb.
