Just keeping up on this technology that ive been disscussing here, it also corilates with the video i posted here a while back, now this is civilian,
Darpa has been working on this for years, but here is a great insight into it.
Contact: Jennifer Donovan
Michigan Technological University
Now you see it, now you don't
An invisibility cloak made of glass
From Tolkien's ring of power in The Lord of the Rings to Star Trek's Romulans, who could make their warships disappear from view, from Harry
Potter's magical cloak to the garment that makes players vanish in the video game classic "Dungeons and Dragons, the power to turn someone or
something invisible fascinates mankind. But who ever thought that a scientist at Michigan Technological University would be serious about building a
working invisibility cloak?
That's exactly what Elena Semouchkina, an associate professor of electrical and computer engineering at Michigan Tech, is doing. She has found ways
to use magnetic resonance to capture rays of visible light and route them around objects, rendering those objects invisible to the human eye.
Semouchkina and colleagues at the Pennsylvania State University, where she is also an adjunct professor, recently reported on their research in the
journal Applied Physics Letters, published by the American Institute of Physics. Her co-authors were Douglas Werner and Carlo Pantano of Penn State
and George Semouchkin, who works at Michigan Tech and Penn State.
They describe developing a nonmetallic cloak that uses identical glass resonators made of chalcogenide glass, a type of dielectric material (one that
does not conduct electricity). In computer simulations, the cloak made objects hit by infrared waves—approximately one micron or one-millionth of a
meter long—disappear from view.
Earlier attempts by other researchers used metal rings and wires. "Ours is the first to do the cloaking of cylindrical objects with glass,"
Her invisibility cloak uses metamaterials, which are artificial materials having properties that do not exist in nature, made of tiny glass resonators
arranged in a concentric pattern in the shape of a cylinder. The "spokes" of the concentric configuration produce the magnetic resonance required to
bend light waves around an object, making it invisible.
Metamaterials, which huse small resonators instead of atoms or molecules of natural materials, straddle the boundary between materials science and
electrical engineering. They were named one of the top three physics discoveries of the decade by the American Physical Society. A new researcher
specializing in metamaterials is joining Michigan Tech's faculty this fall.
Semouchkina and her team now are testing an invisibility cloak rescaled to work at mocrowave frequencies and made of ceramic resonators. They're
using Michigan Tech's anechoic chamber, a cave-like compartment in an Electrical Energy Resources Center lab, lined with highly absorbent
charcoal-gray foam cones. There, antennas transmit and receive microwaves, which are much longer than infrared light, up to several centimeters long.
They have cloaked metal cylinders two to three inches in diameter and three to four inches high.
"Starting from these experiments, we want to move to higher frequencies and smaller wavelengths," the researcher said. "The most exciting
applications will be at the frequencies of visible light."
So one day, could the police cloak a swat team or the Army, a tank? "It is possible in principle, but not at this time," Semouchkina said.
Her work is supported in part by a grant from the National Science Foundation.
Link to post that has the Video of an allegad cloak used in Iraq.