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Those that have seen the Harry Potter movies may remember his magic cloak that enabled him to be invisible from those around him. Sounds a bit fantastical and far-fetched doesn’t it? Well, the future may be closer than you think.

The ability to hide something from sight, is usually accomplished by using what is known as a superlens. This type of lens contains a negative refraction index,  the “refraction” part obviously meaning bending. In this case it allows it to bend electromagnetic waves back upon themselves. So, as a result, the object appears “invisible.” Voila! No bulky cloak even needed.

Although superlensing isn’t exactly yet feasible for making something huge like a military warship invisible, there is still promise for more standard large objects. This is being done using copper-based meta-materials to create a type of cloaking cylinder.  Work is also being done on the lenses by Graeme Millton, of the University of Utah, who is currently working in mathematical models for the superlenses. 

“We’ve seen it numerically—not in practice, but we’ve got a theoretical proof that collections of particles become invisible,” said Milton of their superlens work.

The meta-material cylinder which is being worked on at Duke University is different from the lens at Utah in that it causes microwaves to be bent around itself rather than reflected. Its cylinder has patterns invisible to the naked eye on its surface, which act to redirect the waves striking it, instead of allowing them to bounce off.

The Duke cylinder still needs work because there is still distortion which is visible in microwave images, however there are clearly implications for some real applications. Initiate…Stealth Mode.

Via [DailyTech]