It’s been a while since I’ve had the opportunity to blog about invisibility cloak tech (seven months on the dot, to be exact), but here’s the latest from Germany’s Karlsruhe Institute of Technology.
From the second link:
Researchers at Germany’s Karlsruhe Institute of Technology report they were able to cloak a tiny bump in a layer of gold, preventing its detection at nearly visible infrared frequencies.
Their cloaking device also worked in three dimensions, while previously developed cloaks worked in two dimensions, lead researcher Tolga Ergin said.
The cloak is a structure of crystals with air spaces in between, sort of like a woodpile, that bends light, hiding the bump in the gold later beneath, the researchers reported in Thursday’s online edition of the journal Science.
In this case, the bump was tiny, a mere 0.00004 inch high and 0.0005 inch across (100 microns x 30 microns), so that a magnifying lens was needed to see it.
“In principle, the cloak design is completely scalable; there is no limit to it,” Ergin said. But, he added, developing a cloak to hide something takes a long time, “so cloaking larger items with that technology is not really feasible.”
“Other fabrication techniques, though, might lead to larger cloaks,” he added in an interview via e-mail.