German scientists have successfully fabricated materials capable of "bending" the path of light rays that people can not see objects in three-dimensional space.
With the kind of metamaterial that can hide in front of people's eyes, we can make things that people don't see. And so, the dreams of the boys about fairy tales as in the fairy tales will no longer be illusory.
The BBC said that in the past few years, scientists have developed a number of devices capable of "turning" objects before human eyes. Some devices have the ability to deflect the light that was previously built. However, with these devices the object only becomes invisible when the viewer looks at a certain angle. If you look at another corner, the object will reveal.
Duke University scientists in the United States have built a material capable of stealing objects in two-dimensional space. But their invention is only applicable to microwave waves (microwaves). Like normal light and radar waves, microwaves are always reflected back in contact with objects, causing the human eye to see them. Visible light and ultra-short waves also create shadows of objects.
Tolga Ergin, an expert at the Karlsruhe Institute of Technology in Germany, wants to create a device that can hide objects from every angle of view. He said his invention is based on a new concept: People can distort space with materials. Ergin and colleagues designed a form of photonic metamaterial that could deflect the path of light. If you wrap the metamaterial outside any object, the light will deflect and change the transfer rate when in contact with the material so that the human eye cannot see the object.
The new metamaterial is in fact a crystal structure alternating with spaces for air. According to the AP, scientists can change the size of the gaps to alter the refractive index of the material. Ergin and his colleagues went further than Duke University's research group in that their materials could deflect the propagation direction of infrared rays - electromagnetic radiation has a longer wavelength than the light that humans see but shorter than microwave waves.
By changing the metabolic refractive index of metamaterials, experts can "transform" the object to light wavelengths a little longer than ordinary light. Thus, metamaterials will officially be called "stealth materials" when it can change the direction of visible light, making it impossible for people to see objects wrapped in materials.
