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harry potter-like invisibility cloak works (in a lab) - polycarbonate film

by:Cailong     2019-07-20
harry potter-like invisibility cloak works (in a lab)  -  polycarbonate film
The miniature version of the Harry Potter stealth cloak is now there, although it only works under microwave light, and so far there is no visible light.
Still, it's a pretty trick, and the physicist who created the new cloak says it's a step closer to implementing an invisible cloak that can hide a person during the day.
The invention is made of a new material, called a water curtain, which is made of a copper band attached to a flexible polycarbonate film.
Copper bars are only 66 microns (
1 m of 66 million)
The thickness is 100 microns, and the two are combined with diagonal fish nets.
Google Cloud service interrupted the missing connadik state mother Virginia Beach shooting protesters interrupted Harris's creation, unlike previous attempts to create an invisible cloak, which aims to bend the light around the object, so that they do not scatter or reflect it, which is a dependent on so-
Called bulk super material.
Instead, this new cloak uses a technique called cloak stealth to offset the waves that bounce off a shield object so that no one can survive to reach the observer's eyes. [10 Real-Life Sci-Fi Inventions]
"When scattering fields from cloaks and objects interfere, they offset each other, and the overall effect is transparent and invisible at all viewing angles," Joint Study
Andrea Aru, a physicist at the University of Texas at Austin, said in a statement.
In the lab test, Alu and his colleagues managed to hide a 7-inch-long (18 centimeters)
Look at the cylindrical rod from the perspective of microwave light.
The same technique, they say, should also be able to cover objects with strange and asymmetrical shapes.
"The advantage of cloak compared to existing technology is its consistency, ease of manufacture, and increased bandwidth," said Alu . ".
"We have shown that there is no need for bulk hypermaterials to remove the scattering of objects ---
A simple patterned surface can be consistent with the object and is even better in many ways than bulk hypermaterials.
"In principle, the same cloak can also be used to hide objects within the visible range, although it may only apply to teensy-
At least a small object at first.
"In fact, at the visible frequency, super-material is easier to implement than bulk super-material, and this concept can bring us closer to actual implementation," said Alu . ".
"However, the size of the object that can be effectively covered by this method varies with the change of the operating wavelength, so when applied to the optical frequency, we can effectively prevent the scattering of the millimetresized objects.
"This invention is not only a novelty to stimulate Harry Potter fans and aspiring spies.
Researchers say it can be used in non-invasive sensing devices or biomedical instruments.
They described their devices in the new physics magazine, published in March 26.
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Original article about life science. com.
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