Canada's "Super Stealth Biotechnology" Company Successfully Developed "Invisible Cloak".

< p > "if I can stealth..." I believe many people have had such illusions. In ancient times, both the East and the West had many legends about invisibility, and the invisibility cloak in Harry Potter did not allow many people to flow through their saliva. < /p >
< p > < strong > > a href= "http://www.91se91.com/news/index_f.asp" > invisibility cloak < /a > really exist? < /strong > /p >
Before "P", Canada's "super invisible biotechnology" company announced in an interview with CNN that they had invented the "invisible cloak". According to the "simulation effect map" released on the website of the company, the "invisibility cloak" can change the pattern that is integrated with the environment according to different environments, and the woman hiding behind the invisibility garment looks almost completely disappeared. < /p >
< p > more amazing is that according to the introduction, stealthy clothes < a href= "http://www.91se91.com/" target= "_blank" > clothing < /a > can also stealth successfully under the detection of military night vision glasses, infrared and thermal imaging technology. However, the company refused to provide the media with the application results of the "invisible fabric" real samples. What we can see is the effect picture of PS. < /p >
< p > for the production principle of invisibility cloak, the company CEO Gaye Cramer is only ambiguous: "invisible cloak" can bend the surrounding light, so that the person covered by it is completely stealthy. He also revealed that "cameras, batteries, lights or mirrors are not used, and the weight is light and the cost is not expensive." < /p >
< p > strong > negative refractive index material makes "stealth" possible < /strong > /p >
Gaye's "stealth principle of bending light" is actually not a new concept, which involves negative refractive index materials. P < /p >
< p > Russian scientist Faith Lage first proposed the concept of "negative refractive index material" in 1967. Because light travels fastest in air, all materials in nature are positive refractive index materials. < /p >
When the light incident from positive refractive index material to the interface with positive refractive index material, the projective light and refraction ray are located on both sides of the interface normal line, respectively. P When light comes from the material with positive refractive index to the interface with negative refractive index material, the incident light and refraction ray lie on the same side of the normal direction of the interface, that is to say, there is distortion in the material. As the light turns, negative refraction materials and objects hidden in negative refractive materials are invisible. < /p >
< p > but negative refractive index materials really exist? In 2000, the research team led by Professor David Smith of Duke University developed a grid material that can change the propagation path of light. < /p >
In P 2003, a number of laboratories in the world identified the findings of the Smith group. The breakthrough of natural laws laid the foundation for the development of stealthy clothes. < /p >
< p > < strong > how to knit the invisibility cloak? < /strong > /p >
< p > Smith's research confirmed the feasibility of "negative refractive index material". < /p >
In October 2008, P, an expert in materials science at Purdue University in Indiana, Shalaev, published an article in the journal Science, announcing that he developed a negative refractive index metamaterial. Shalaev said that when the size of the microstructure is equal to the wavelength of the light wave, it can exhibit some optical and electromagnetism specificity, "and my material structure is smaller than the optical wave length." < /p >
< p > ordinary materials are too rough, and light always reflects on them. The structure is even smaller than the photon, which makes it possible for light to flow like a stream through a cobblestone. Shalaev relied on a row of tiny needles radiating outward from the center of the center, which reduced the refraction and distortion of the light to almost zero, so that the light around the stealth garment was bent, thus achieving "stealth". < /p >
< p > whether Smith or Shalaev, there is a problem with the invisible materials they have studied: since the light has already slipped away, the people hiding in the invisibility cloak can not see the outside. So invisibility cloaks need to be matched with an eye. < /p >
< p > September 2008, Shanghai Jiao Tong University and Hong Kong University Science & Technology put forward the theory of "anti invisibility cloak". When a invisibility cloak makes the surrounding light bend, any area exposed to the invisibility cloak can make some of the light return to its original state, so that it can be seen. By matching the invisibility cloak and the invisibility cloak, people in the invisibility cloak can observe the outside world. < /p >
< p > < strong > bending of the naked eye light > /strong > /p >
Liu Ruopeng, who is now dean of the Institute of science and technology in Shenzhen, has studied such invisibility cloak. P He was also studying for Ph.D. at Duke University. {page_break} < /p >
< p > the invisibility cloak they have studied is made of thousands of tiny "special materials", which can control light by using glass like materials. Through a series of complex calculations, the researchers arranged these "special materials" to "grab" microwaves and make their paths bend. < /p >
< p > the invisibility cloak can cause the microwave bomb to move away from the surface to the mirror when it is covered with objects. The deflection of the light enables the viewer to see through the rear of the object, thus making the object invisible. < /p >
< p > however, Liu Ruopeng said that such a "invisibility cloak" is only limited to the microwave stage, and it is not what people think of as "no matter", how to extend it to the optical band, and achieve invisible effect in naked eye visible light. There is still a lot of work to do. < /p >
Zhang Xiang, director of the National Center for nano science research in the US, said in 2009 that negative refraction materials can bend visible and near infrared light on nanometer scale. If the next step can achieve this spectacle on normal scale, stealth effect is expected to become a reality. P < /p >
< p > in this sense, if the Canadian company can really develop a href= "http://www.91se91.com/news/index_h.asp" > invisibility cloak "/a", deceiving our naked eyes is indeed a noticeable finding. But this needs to wait for the company to show the real guy to prove it, rather than several PS effects. < /p >