A Rip Can Now Be Seen in Invisibility Cloaks
Harry Potter might be disappointed but the truth is invisibility cloaks are not as infallible as they were touted to be.
In 2009, two teams claimed to have created invisibility cloaks which operated on the same design. These cloaks steered light around the object they covered and made people think they were able to see the background i.e. the object covered by the invisibility cloaks appeared to have “disappeared” from sight. The two teams were Michal Lipson and his team at Cornell University and Xiang Zhang and his team UC Berkeley.
This created a lot of excitement all around the world since a sci-fi dream was about to come true. However, the joy has been short lived since a flaw has recently been discovered in these invisibility cloaks.
The Rip and the Tear in Invisibility Cloaks
Researchers have discovered that invisibility cloaks cannot completely hide the objects that they cover. This is because invisibility cloaks operate on the principle that they should be able to steer light around them. This allows the objects that lie under or behind them to “disappear” from a viewer’s line of vision.
This in itself is difficult because the optical property of these objects has to be changed first. This is known as optical anisotropy. Now, the first generation of invisibility cloaks managed to hide an object only in 2D and only when a solitary wavelength of microwave light was focussed on them.
Then, John Pendry from London’s Imperial College came up with the “carpet cloak”. An extra layer was inserted to make objects invisible. This worked for a range of visible light and made the concept of invisibility cloaks a reality.
But now, Baile Zhang and his team from MIT (Massachusetts Institute of Technology), Cambridge, have found a flaw. In simple terms, they have been able to prove that invisibility cloaks only work when the objects are viewed at right angles. However, when the viewing angle changes, the “hidden” object is revealed.
Posted in 
Tags: 
Heaps of Great information in your blogpost, I bookmarked your site so I can visit again in the near future, Cheers
NASA’s recent find of water on the moon brings the possibility of a moon base on the surface even closer to happening then ever before, just wondering what others think of the idea. Myself I’m a big supporter of colonizing space not only for research or mining, but also even a “back-up” if something would happen to human exsistence on earth.
My favorite perfume is white diamond. what is yours?
I’ve found your site on Google and i do love that you wrote about this exciting movie of 2010!
As I understand it, a decade ago there were 9 planets in our solar system. A few years ago an international astronomical society not only demoted Pluto to be a dwarf planet but re-classified 2 other bodies as dwarf planets. Now, they say there are 8 planets in our solar system.
Ha ha ha ha… Very funny. I liked it a lot.
I thought your readers might be interested in this Free PPC management course.
Astronomers using the twin 10-meter telescopes at the W. M. Keck Observatory in Hawaii recently explored one of the most compact dust disks ever resolved around another star. If placed in our own solar system, the disk would reach nearly to Jupiter’s orbit. An outer disk that extends hundreds of times farther accompanies the compact inner disk.
What are the clothes that make you feel comfortable or that you like most? I’d say casual clothes like jeans, tennis shoes and shirt. I’m not a guy who likes to put a suit or blazer on, for instance, unlesse the situation requires it.
If this comment doesnt appear after reading all those instructions Im sending a carrier pigeon next
i am usually roaming around the web the majority of the working day thus I usually tend to read a whole lot, which unfortunately isnt normally a beneficial thing as nearly all of the internet sites I look at are constructed of pointless crap copied from several other internet websites a million times, but I have to give you credit this site is genuinely enjoyable and also consists of a lot of unique material, for that reason kudos for breaking the phenomena of merely duplicating other people’s websites, see ya!
Terrific work! This is the type of information that should be shared around the web. Shame on the search engines for not positioning this post higher!
This is such a great resource that you are providing and you give it away for free. I enjoy seeing websites that understand the value of providing a prime resource for free. I truly loved reading your post. Thanks!