The cloaking devices that are used to render spacecraft invisible in Star Trek might just work in reality, two mathematicians have claimed. They have outlined their concept in a research paper published in one of the UK Royal Society's scientific journals. Nicolae Nicorovici and Graeme Milton propose that placing certain objects close to a material called a superlens could make them appear to vanish. It would rely on an effect known as "anomalous localised resonance". However, the authors have so far only done the maths to verify that the concept could work. Building such a device would undoubtedly pose a significant challenge.

It's fairly interesting. However, all of these "cloaking" stories suffer from basically the same problem. Making something invisible is much, much more complicated than blocking light, or cancelling light, or anything like that.

To become invisible in the sense of Star Trek cloaking device requires much more than "not being able to see" the object. It means not being able to detect the presence of the object... under real-world lighting conditions, with real-world scenes _behind_ the object, and from more than one vantage point at the same time....

Not to mention the device would probably have to be much bigger than the thing you are trying to cloak.