The great unappreciated weakness of invisibility cloaks is that they only make things invisible to human eyes. Or x-ray imagers. Or ultraviolet sensors, infrared image analyzers, echo-location audio ...

Since invisibility cloaks were first suggested by transformation optics theory, there has been much work on the theoretical analysis and design of various types and a few experimental verifications at ...

Metamaterials have been used to make invisibility cloaks. To make an inaudibility cloak, all you need are some sheets of plastic and good mathematical modeling. Sight is based on the assumption that ...

Rather than building stronger ocean-based structures to withstand tsunamis, it might be easier to simply make the structures disappear. Rather than building stronger ocean-based structures to ...

In the computer simulation, a slow-moving cloaked sphere leaves no wake at all as it moves downward (inset, left), while the cloak still reduces the turbulence behind the sphere at faster speeds ...

Invisibility cloak research focuses on how to make light waves pass through an object as though nothing is there. Now what if you took that same basic principle and applied it to other types of waves ...