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“To provide some cases closer to us, a diffusive environment would be what we find on a foggy day, in cloudy water or in a place with smoke, but also in our organic tissue. Our proposal establishes the basis to make a plane in the fog or a submarine in the sea undetectable,” said García-Meca.
“It would be fairly straightforward, because all we would need is two different materials with a specific diffusivity; by playing around with them, we would be capable of producing the cloak that would cause the light to circulate around the object in such a way that the object would be hidden. We could achieve perfect invisibility; but only for diffusive atmospheres, of course,” said lead researcher Bakhtiyar Orazbayev, who is conducting his work at the Public University of Navarre.
“It has recently been shown that this difficulty disappears if the object one wants to conceal is in a diffusive environment. In this case, and unlike in non-diffusive atmospheres, it is possible to build, in a fairly straightforward way, invisibility cloaks of a macroscopic size that work for any light direction and on a high bandwidth. However, the cloaks proposed so far do not work properly when the object is illuminated by short light pulses, essential in a large number of applications,” pointed out Alejandro Martínez-Abiétar, researcher at the Centre for Nanophotonic Technology.
“Apart from the ones already mentioned, they would render invisible objects susceptible to causing interference in communication systems and in image tomography systems in which work is often done with diffusive mediums such as organic tissue,” concluded Miguel Beruete, a researcher at the Public University of Navarre.