New York scientists unveil 'invisibility cloak'

[Buster's Uncle]

New York scientists unveil 'invisibility cloak' to rival Harry Potter's
Reuters
By Caurie Putnam  13 hours ago



A cloaking device using four lenses developed by University of Rochester physics professor John Howell and graduate student Joseph Choi is demonstrated in Rochester, New York in this September 11, 2014 University of Rochester.REUTERS/J. Adam Fenster/University of Rochester/Handout via Reuters



ROCHESTER N.Y. (Reuters) - Watch out Harry Potter, you are not the only wizard with an invisibility cloak.

Scientists at the University of Rochester have discovered a way to hide large objects from sight using inexpensive and readily available lenses, a technology that seems to have sprung from the pages of J.K. Rowling's Harry Potter fantasy series.

Cloaking is the process by which an object becomes hidden from view, while everything else around the cloaked object appears undisturbed.

"A lot of people have worked on a lot of different aspects of optical cloaking for years," John Howell, a professor of physics at the upstate New York school, said on Friday.

The so-called Rochester Cloak is not really a tangible cloak at all. Rather the device looks like equipment used by an optometrist. When an object is placed behind the layered lenses it seems to disappear.



A cloaking device using four lenses developed by University of Rochester physics professor John Howell and graduate student Joseph Choi is demonstrated in Rochester, New York in this September 11, 2014 University of Rochester handout photo. REUTERS/J. Adam Fenster/University of Rochester/Handout via Reuters


Previous cloaking methods have been complicated, expensive, and not able to hide objects in three dimensions when viewed at varying angles, they say.

"From what, we know this is the first cloaking device that provides three-dimensional, continuously multidirectional cloaking," said Joseph Choi, a graduate student who helped develop the method at Rochester, which is renowned for its optical research.

In their tests, the researchers have cloaked a hand, a face, and a ruler – making each object appear "invisible" while the image behind the hidden object remains in view. The implications for the discovery are endless, they say.

"I imagine this could be used to cloak a trailer on the back of a semi-truck so the driver can see directly behind him," Choi said. "It can be used for surgery, in the military, in interior design, art."

Howell said the Rochester Cloak, like the fictitious cloak described in the pages of the Harry Potter series, causes no distortion of the background object.



University of Rochester Ph.D. student Joseph Choi demonstrates a cloaking device using four lenses in Rochester, New York in this September 11, 2014 University of Rochester handout photo. REUTERS/J. Adam Fenster/University of Rochester/Handout via Reuters


Building the device does not break the bank either. It cost Howell and Choi a little over $1,000 in materials to create it and they believe it can be done even cheaper.

Although a patent is pending, they have released simple instructions on how to create a Rochester Cloak at home for under $100:

http://www.rochester.edu/newscenter/watch-rochester-cloak-uses-ordinary-lenses-to-hide-objects-across-continuous-range-of-angles-70592/

There is also a one-minute video about the project on YouTube:

How Does Cloaking Work in the Real World?

(Writing by Frank McGurty; Editing by Sandra Maler)


http://news.yahoo.com/york-scientists-unveil-invisibility-cloak-rival-harry-potters-014359862.html