Hidden sensor could send, receive information without being detected
Cell phone antennas, radio receivers and GPS devices may one day go incognito. In a paper to appear in Physical Review Letters, Nader Engheta and Andrea Alù propose a new cloaking method that cancels out the electromagnetic waves bouncing off an object. The concept may ultimately lead to surreptitious sensors that can collect and send messages without detection.
"This is a fascinating paper addressing a very important challenge,” s