June 8th, 2006



Two new recipes tell how to make objects vanish

Two prescriptions for an invisibility cloak have been unveiled by physicists in the United Kingdom and the United States. The researchers say that in principle the technologies needed for building these devices already exist. "Invisibility is visibly close," says Ulf Leonhardt of the University of St Andrews in Scotland, one of the researchers behind the proposals.
He and John Pendry of Imperial College London, UK, and their co-workers have independently described similar ways to create an invisible 'hole' in space, inside which objects can be hidden. They say it is possible to guide light around the hole, rather like water flowing around a rock in a river, so that the object inside it cannot be seen.