Invisibility | Electronics Seminar Topic
Invisibility
“Invisibility” has not remained a thing of science fiction
movie or story. Imagine when one will be able to disappear in the air and no
one is able to see him like the Harry Potter invisibility Cloak. Scientist has
discovered the devices which are able to bend the light around three
dimensional objects making them to “disappear”.
The materials used for the invisibility devices are
artificially designed and research are being carried out since than the idea
strike the mind of thinkers of invisibility. The breakthrough could lead to
systems for rendering anything from people to large objects, such as tanks and
ships, invisible to the eye – although this is still years off. The day is not
for away when we have invisibility cloak large enough to hide us.
The things which our eyes are not able to see are considered
as “ Invisible”. Light is neither absorbed nor reflected by the objects,
passing like water flowing around a rock. As a result, only the light from
behind the objects can be seen.
The devices which are going to make us hide are
invisibility devices. Researchers at the University of California at Berkeley,
whose work is funded by the American military, have engineered materials that
can control
Nature, are expected to report the results in near future. .
The concept of invisibility would involve surrounding the object by a
"metamaterial" . Meta-material is a type of composite material that
has unusual electromagnetic properties.
According to the researchers, light
rays incident on the material would be bent around the object, only to emerge
on the other side in exactly the same direction as they began. Although the
work is only theoretical, the researchers reckon that materials invisible to
radio waves could be produced within five years
