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Researchers at Northwestern University have created a new kind of cloaking material that can render objects invisible in the terahertz range.

Watching things disappear "is an amazing experience," admits Joachim Fischer of the Karlsruhe Institute of Technology in Germany. But making items vanish is not the reason he creates invisibility cloaks. Rather, the magic-like tricks are attractive demonstrations of the fantastic capabilities that new optical theories and nanotechnology construction methods now enable.

Invisibility appears to be the next possible advance in the use of Terahertz radiation in medicine, security, and communications.