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If you think that the invisibility cloak that you see in Harry Potter movie series is fictitious then you need to change your perception since a portable invisibility cloak has been developed by a group of German researchers that can effectively shield objects. Though, currently, it is small enough to use in classrooms but the accomplishment is big.
The cloak works on simple laws of science. It uses diffused scattered light and like frosted window panes, it lets light in but conceals the source of light.
By dispersing light, the material slows down the propagation speed of light waves through the medium.
The speed of the light can then be increased to make up for the longer path length around the hidden object.
Robert Schittny from Germany’s Karlsruhe Institute of Technology, who led the project stated, “Our cloak takes advantage of the much lower effective propagation speed in light-scattering media.”
Though, the cloak right now cannot hide a human, but it can make small objects disappear from sight.
According to the reports, in the cloak, the object to be concealed is placed inside a hollow metal cylinder coated with acrylic paint.
The tube is embedded within a block of polydimethylsiloxane, a commonly used organic polymer, doped with titanium dioxide nano-particles that make it scatter light.
If the time taken by the light to travel through the polydimethylsiloxane block is proportionate to the time it takes to travel through the cloak, the core will become invisible.