Can you see me now?
Invisibility cloaks may be just around the corner
In 1897, H.G. Wells created a fictional scientist who became invisible by changing his refractive index to that of air, so that his body could not absorb or reflect light. More recently, Harry Potter disappeared from sight after wrapping himself in a cloak spun from the pelts of magical herbivores.
“Imagine that you look at the object, which is placed in front of a light source,” she explains.
“The object would be invisible for your eye if the light rays are sent around the object to avoid scattering, and are accelerated along these curved paths to reach your eye undistinguishable from direct straight beams exiting the source, when the object is absent.”
At its simplest, the beams of light flow around the object and then meet again on the other side so that someone looking directly at the object would not be able to see it–but only what’s on the other side.
“You would see the light source directly through the object,” said Semouchkina. “This effect could be achieved if we surround the object by a shell with a specific distribution of such material parameters as permittivity and permeability.”
So if and when the military gets involved (like they haven’t) that’s when we’ll see strides in development.
Read more at Tim’s Scared Stiff
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