Scientists make progress in developing an 'invisibility cloak'


Canadian researchers from the National Institute for Scientific Research (INRS) in Montreal have designed a device that is capable of camouflaging objects by making them invisible. They explained how this device worked in a publication in the journal Optica.

Researchers at the National Institute of Scientific Research (INRS) in Montreal announced that they have developed an "invisibility cloak" that can completely conceal objects from the perception of the human eye, according to the newspaper Optica. Compared to others of the same type, this device can play on the colors of the light spectrum, the waves of which are differently reflected by the surface of objects and make them invisible. 


“We have reached a breakthrough in research regarding invisibility. We have succeeded in making an object completely invisible to the human eye. The light passes through the object as if it did not exist,” said José Azana, one of the scientists who participated in this study.


The researchers showed how this device they called an “invisibility cloak” worked on an object that only reflects green light. In order to camouflage an object, scientists use a special filter which aims to temporarily shift the green frequencies of the spectrum that shine on the object towards blue. And then they use another filter that brings those frequencies back to green on the other side of the object. As a result, the human eye cannot see the object.


Researchers point out that visible light is in fact an electromagnetic spectrum composed of frequencies of electromagnetic radiation. The human eye can only see a small range of this color spectrum, from violet at one end to red at the other. When a person sees an object, their eye perceives the way in which these light frequencies are reflected or not reflected on the surface of this object.

For now, this device only works in one direction, when a viewer's eye follows the path of the light and looks toward the object through the filter. But scientists assume that, theoretically, with this method it will be possible to make an object invisible in all directions.

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