U.S. - Chinese scientists to break the cloak of invisibility key technical barriers-Iota

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Service > U.S. - Chinese scientists to break the cloak of invisibility key technical barriers

U.S. - Chinese scientists to break the cloak of invisibility key technical barriers

A pair of chopsticks into the cup, below the surface of the part will be slightly bent, but on the surface of the water, the lower part of the tilt in the direction is the same; if you put a pair of chopsticks into "negative refractive index metamaterials, you will see the material of chopsticks completely" broken ", namely with the air of chopsticks tilt angle instead... This is the magic of the super material. Yesterday, the American Chinese scientist and University of Arizona Department of physics professor Xin Hao guest science hall, in the Shanghai Association for science and Technology Forum, he and his collaborators in the field of metamaterials the latest research results, in the laboratory successfully developed active metamaterials are introduced, the breakthrough "invisibility cloak" key technical barriers.
The so-called super material, is a synthetic material that has the nature does not exist. Among them, the electromagnetic energy of the light (electromagnetic wave) propagation of unusual effective control, through artificial design, arbitrary set of optical refractive index, including negative refractive index and zero refractive index. Since the beginning of this century, the material has become a hot field of materials science, many research results make people think, "Potter Harry" and other novels in the description of "invisibility cloak" will become a reality.
Until last year, laboratory in the most advanced electromagnetic metamaterials there are still three defects: one is applicable only to a narrow frequency and single frequency, such as under the red light irradiation, super material "invisibility cloak" can make light to bypass the wrapped object, but in another frequency of light object prototype. Second, the material loss is big, exposure to super materials on most of the light will be absorbed, unable to realize stealth effect; ultra material with the 3D structure of the complex, difficult to manufacture.
In the face of the first two defects, Xin Hao where the research team recently discovered a new method: battery powered tunnel diode and micro nano manufacturing technology into the design, research and development of a kind of active negative refractive index materials. It can not only make the performance of the negative refraction, but also can not reduce the energy of the light, but in the external power supply to increase the energy of the light. "This is the first time in the laboratory to produce a negative refractive index and gain at the same time, the gain can be converted to bandwidth, so that the visible light of all wavelengths can be bypassed 'stealth clothes'." Xin Hao said.
"The British media asked me:" in your lifetime, can you see "Harry Porter" in the invisibility cloak out? I give a positive answer." Xin Hao told the audience that in his opinion, Shanghai scientific researchers in R & D super materials process, should make full use of 3D printing technology, solve the current super materials of the three defects, fast to create has a complex three-dimensional structure of the material.

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