中美共同赞助Duke研发隐形技术

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<br/><br/>Science closing in on cloak of invisibility<br/><br/><a href="http://news.yahoo.com/s/ap/20090115/ap_on_sc/sci_cloak_of_invisibility" target="_blank">http://news.yahoo.com/s/ap/20090115/ap_on_sc/sci_cloak_of_invisibility</a><br/>Thu Jan 15, 3:21 pm ET<br/><br/><br/><br/>WASHINGTON – They can't match Harry Potter yet, but scientists are moving<br/>closer to creating a real cloak of invisibility.<br/><br/>Researchers at Duke University, who developed a material that can "cloak" an<br/>item from detection by microwaves, report that they have expanded the<br/>number of wavelengths they can block.<br/><br/>In 2006 the team reported they had developed so-called metamaterials that<br/>could deflect microwaves around a three-dimensional object, essentially<br/>making it invisible to the waves.<br/><br/>The system works like a mirage, where heat causes the bending of light rays<br/>and cloaks the road ahead behind an image of the sky.<br/><br/>The researchers report in Thursday's edition of the journal Science that<br/>they have developed a series of mathematical commands to guide the<br/>development of more types of metamaterials to cloak objects from an<br/>increasing range of electromagnetic waves.<br/><br/>"The new device can cloak a much wider spectrum of waves — nearly limitless<br/>— and will scale far more easily to infrared and visible light. The<br/>approach we used should help us expand and improve our abilities to cloak<br/>different types of waves," senior researcher David R. Smith said in a<br/>statement.<br/><br/>The new cloak is made up of more than 10,000 individual pieces of fiberglass<br/>arranged in parallel rows. The mathematical formulas are used to determine<br/>the shape and placement of each piece to deflect the electromagnetic waves.<br/><br/>The research was supported by Raytheon Missile Systems, the Air Force Office<br/>of Scientific Research, InnovateHan Technology, the National Science<br/>Foundation of China, the National Basic Research Program of China and<br/>National Science Foundation of Jiangsu Province, China.<br/>