Cloak of Invisibility Possible
Researchers: Cloak of Invisibility Technically Possible
Friday, May 26, 2006
WASHINGTON Â The key to creating a Harry Potter-like invisibility cloak lies in manmade materials unlike any in nature or the Hogwarts School of Witchcraft and Wizardry, researchers say.
They're laying out a blueprint for turning science fiction into reality. And they say that, in theory, nothing's stopping them from making such a cloak. Well, almost nothing: They still need to perfect the manufacture of those exotic materials with an ability to steer light and other forms of electromagnetic radiation around a cloaked object, rendering it as invisible as something tucked into a hole in space.
Engheta has done his own work on invisibility using novel materials called metamaterials.
Pendry and his co-authors also propose using metamaterials because they can be tuned to bend electromagnetic radiation Â radio waves and visible light, for example Â in any direction.
A cloak made of those materials, with a structure designed down to the submicroscopic scale, would neither reflect light nor cast a shadow.
Instead, like a river streaming around a smooth boulder, light and all other forms of electromagnetic radiation would strike the cloak and simply flow around it, continuing on as if it never bumped up against an obstacle.
That would give an onlooker the apparent ability to peer right through the cloak, with everything tucked inside concealed from view.Read the Rest.