30 Jan '14, 5pm

How to Make a Better Invisibility Cloak—With Lasers

How to Make a Better Invisibility Cloak—With Lasers

A material with this property more or less puts light in reverse gear. The best way to see how this works is to consider two parameters that are used to describe light propagation—the velocity of electromagnetic energy propagation and the phase velocity. The first describes the overall flow of the light, and the second describes how the light waves—the individual peaks and troughs—move. In an ordinary material, electrons respond to incoming fields by jiggling in such a way that they create their own electromagnetic field. The resulting field—a combination of the incoming field and the material’s response—will move in the same direction as the incoming radiation does, albeit with some lag and at a lower speed. As with the incoming field, both the energy and phase vectors are positive. But in a material with a negative index of refraction, energy and phase move in opposite d...

Full article: http://spectrum.ieee.org/semiconductors/materials/how-to-...

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