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Invisibility Cloak Gets a Little Closer to Reality
Scientists are continuing to work towards that Star Trek cloaking device that seems so cool. For decades we've had to make do with just radar invisibility, but now scientists have found a way to make objects all but invisible to microwaves.
The new technology uses metamaterials, constructed of repeating tiles of common material such as fiberglass or copper, that pass the microwave light around the object, splitting it in two then reuniting it on the other side. Traditional radar stealth works by deflecting or absorbing waves so they are never sent back to the antenna.
The new method means the object becomes essentially transparent at microwave wavelengths. This sets the stage for scaling the technology to visible wavelengths. If the same method can be applied to visible light you would simply see what is behind the object cloaked by the metamaterials.
There are several limitations to overcome still. Currently the technology can only be applied to one wavelength at a time. Materials have not been manufactured that can bend a wide spectrum of light. Also manufacturing metamaterials that will bend shorter wavelengths, like visible light, is likely to prove difficult due to restrictions of a pesky little thing called physics.
From The New York Times
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The new technology uses metamaterials, constructed of repeating tiles of common material such as fiberglass or copper, that pass the microwave light around the object, splitting it in two then reuniting it on the other side. Traditional radar stealth works by deflecting or absorbing waves so they are never sent back to the antenna.
The new method means the object becomes essentially transparent at microwave wavelengths. This sets the stage for scaling the technology to visible wavelengths. If the same method can be applied to visible light you would simply see what is behind the object cloaked by the metamaterials.
There are several limitations to overcome still. Currently the technology can only be applied to one wavelength at a time. Materials have not been manufactured that can bend a wide spectrum of light. Also manufacturing metamaterials that will bend shorter wavelengths, like visible light, is likely to prove difficult due to restrictions of a pesky little thing called physics.
From The New York Times
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