Invisibility Cloaks Hit The Big Time - Science News

Invisibility Cloaks Hit The Big Time - Science News: "But now two teams, including an MIT group that published its results in Physical Review Letters in January and another from England and Denmark that published Tuesday in Nature Communications, didn’t bother with metamaterials. They adopted calcite prisms, a type of naturally occurring crystal, to build carpet cloaks. Carpet cloaks aren’t true now-you-see-them-now-you-don’t apparatuses. The bottom of the cloaking device is notched with a small triangle that looks like a bent mirror. Thanks to the optical properties of metamaterials or, in this case, calcite, the bent mirror can look like a flat plane when viewed from some angles. Anything hiding in the notch vanishes."