It's all done with mirrors in this time cloaking method

08/15/2013 | MIT Technology Review online

Mirrors that can be turned on and off take the place of problematic metamaterials in a method of time cloaking proposed by Northwestern University's Miguel Lerma. The method employs mirrors to slow the speed of light before it strikes an object and then accelerate the light afterward on its way to an observer, leaving a time gap in what is being observed.

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