DCMX Reminder: “if they are telling us about it in the mainstream media, they’ve had it for 15 years, at least.”

Pentagon-supported physicists on Wednesday said they had devised a “time cloak” that briefly makes an event undetectable.

The laboratory device manipulates the flow of light in such a way that for the merest fraction of a second an event cannot be seen, according to a paper published in the science journal Nature.

It adds to experimental work in creating next-generation camouflage – a so-called invisibility cloak in which specific colours cannot be perceived by the human eye.

“Our results represent a significant step towards obtaining a complete spatio-temporal cloaking device,” says the study, headed by Moti Fridman of Cornell University in New York.

The breakthrough exploits the fact that frequencies of light move at fractionally different speeds.

The so-called temporal cloak starts with a beam of green light that is passed down a fibre-optic cable.

The beam goes through a two-way lens that splits it into two frequencies – blueish light which travels relatively fast, and reddish light, which is slower.

The tiny difference in speed is then accentuated by placing a transparent obstacle in front of the two beams.                                                                  Continue reading