cloak of invisibility, such as those used Harry Potter, soon become a reality. This new cloak that can make objects invisible to the eye covered.
Cloak is made from two pieces of calcite crystals, minerals are white or colorless commonly found in limestone. Both pieces of crystal are affixed to certain rules.
Calcite is highly anisotropic, properties that make light coming will be forwarded to different angles of light entering from the other side. By using two calcite, the researchers were able to bend light around solid objects are placed between the crystals.
In both crystals there was a gap Kasit right-angled triangles. "Whatever you put in under this loophole will not be visible from the outside," said George Barbastathis from MIT.
Cloak made Massachusetts Institute of Technology and SMART Centre of Singapore is unlike similar robes ever developed. Long robes can only make objects disappear under the rays with a wavelength that is not visible by humans.
Another robe can only eliminate microscopic objects. The new robe was able to work with a light visible to the human eye and can hide the objects are quite large.
Invisibility cloak is still a shortage. One example is the only work a maximum under green light. The researchers deliberately designed with green color because, in addition to calcite can only be configured in a certain light waves, the human eye is very sensitive to green color. Thus clearly Barbastathis.
In addition, the effect is only apparent disappear from certain angles. When viewed from different angles, the object will appear again.
Nevertheless Barbastathis feel confident that his team or other researchers will make a better cloak in the near future.
He also believes that such a cloak would have a use. "In Boston there are many crossroads with a sharp angle. We see the traffic light, you may be confused whether it's light to your path or another path. With this cloak, we can hide the other traffic lights so that motorists are not confused," clear Barbastathis ..
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