Physicists have cloaked a macroscopic object for the first time. And they've done it using conventional materials and techniques.
Engineers built the first invisibility cloak in 2006. This was an impressive device but it had some important limitations, not least of which was that it worked only for a single frequency of microwaves.
One of the biggest questions that physicists have puzzled over since then is whether it is possible to build similar devices that work over the range of frequencies visible to the human eye. Last year, a couple of groups announced a solution to this problem in the form of 'carpet cloaks' that lie over an object, hiding its presence over a range of optical frequencies.
Full story from the Physics ArXiv blog (Technology Review)