Invisibility cloak? Pah! First Demonstration of Time Cloaking…
Moti Fridman and buddies, at Cornell University in Ithaca […] have designed and built a cloak that hides events in time. Time cloaking is possible because of a kind of duality between space and time in electromagnetic theory. In particular, the diffraction of a beam of light in space is mathematically equivalent to the temporal propagation of light through a dispersive medium. In other words, diffraction and dispersion are symmetric in spacetime. […] The device has some limitations. The Cornell time cloak lasts only for 110 nanoseconds that’s not long. And Fridman and co say the best it can achieve will be 120 microseconds.