Sunday, July 17, 2011

Make Time Invisible By Cloaking It




A group of physicists has created time cloaking that is able to hide an event from time itself. The breakthrough comes from Moti Friedman and other researchers at Cornell University. The how part of the way the time cloak works gets very heady indeed. Apparently, the cloak is able to work thanks to a duality between space and time in electromagnetic theory. There is a lot more to the how but the works of the system the team created boils down to a time lens made using electro-optic modulator that can magnify or compress in time.

We see things using light, of course, namely as light scatters on an object. Using materials with a negative index of refraction, experiments have been able to create an 'invisibility cloak' for objects, which is certainly exciting. The downside is they are not in the visible range so Romulans are not going to be invading Earth any time soon.


Schematics of the temporal cloak using a pair of split time-lenses (STL). The STL's are used to create a temporal 'hole' in a probe beam such that any temporal or spectral changes caused by an event within this hole do not occur. The figure is oriented such that the probe light is described by horizontal lines, and lines at different orientations represent different wavelengths. D denotes the magnitude of the total negative or positive group-velocity dispersion.

The cloak places two lenses in a series and sends a beam of light through the lenses, the first lens compresses the light in time and the second decompresses it again. Someone observing the light would view what comes out of the second lens as undistorted as if no event had occurred. The net effect is that the space between the two lenses deletes changes that occur in a short period. Right now, the time cloak only lasts for 110 nanoseconds and the researchers say that the best they can do is 120 microseconds.

I dono about you guys i certainly want to be invisible so lets all hope that its out soon and v can all see it and enjoy it :)......

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