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Invisibility Cloak

Transformation optics is the field of study that maps curved spaces like those in general relativity to anisotropic media that can be constructed as metamaterials. The result is the near-total control of the path of light. Many applications have been considered, but most famous is the cloak of invisibility, which causes light to bypass a given region, rendering anything in it invisible to the outside. This figure illustrates our transformation-optics simulation of a 2D invisibility cloak, with red and blue regions representing peaks and troughs, respectively, of the steady-state electromagnetic wave, originally incident from below. The white spot in the middle shows the cloaked region. (Lewis/Dennis collaboration)

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