Total scattered microwaves as a function of frequency for bulk plastic, the theoretical cloak, and the actual cloak – notice that the actual cloak works better than predicted by the theoretical model (Image: Duke University)
Photograph of a 3D-printed microwave invisibility cloak (Photo: Duke University)
The invisibility cloak can be thought of as is a piece of optical fiber cloth where the threads of the fabric are light that can be bent around an object without breaking, so the shadow disappears (Image: Brian Dodson)
Electric fields inside the new Duke University invisibility cloak (Photo: Duke University)
Yaroslav Urzhumov with the 3D-printed invisibility cloak developed at Duke University
Invisibility cloaks have been around in various forms since 2006, when the first cloak based on optical metamaterials was demonstrated. The design of cloaking devices has come a long way in the past seven years, as illustrated by a simple, yet highly effective, radar cloak developed by Duke University Professor Yaroslav Urzhumov, that can be made using a hobby-level 3D printer.
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