Post: Invisibility Cloak
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04-15-2011, 01:44 AM
#1
Vegetᶏ
Freddy Krueger
Seeing Is Believing: Scientists Make Invisibility Cloak
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Originally posted by another user
It sounds like something out of a Harry Potter book, but German scientists say they have created a three-dimensional invisibility cloak.
Originally posted by another user
The researchers have been able to hide a bump on a gold plate using "metamaterials", making the gold plate appear flat in infrared light.
Tolga Ergin from the Karlsruhe Institute of Technology led the research, which was published Friday in the journal Science.
"You could imagine you have a flat gold mirror and you could put an object on that mirror," he said.
"An observer could immediately tell that there is a bump there and that there is an object hidden.
"Now we can put the three-dimensional carpet cloak on top of that bump so that the bump disappears - so the observer would again see a flat mirror."
The scientists have created what is known as a metamaterial, which is used to cloak an object.
These metamaterials are tailored to change the way light bounces off something, making light bend around an object to render it invisible.
Dr David Powell from the Centre for Linear Physics at the Australian National University says the metamaterials offer the flexibility needed to do this.
"One of the applications of metamaterials is this cloaking," he said.
"And the idea is that because you have these extra degrees of freedom with these metamaterials that you just can't get with normal materials, you can bend light in these weird and wonderful ways."
Tolga Ergin from the Karlsruhe Institute of Technology led the research, which was published Friday in the journal Science.
"You could imagine you have a flat gold mirror and you could put an object on that mirror," he said.
"An observer could immediately tell that there is a bump there and that there is an object hidden.
"Now we can put the three-dimensional carpet cloak on top of that bump so that the bump disappears - so the observer would again see a flat mirror."
The scientists have created what is known as a metamaterial, which is used to cloak an object.
These metamaterials are tailored to change the way light bounces off something, making light bend around an object to render it invisible.
Dr David Powell from the Centre for Linear Physics at the Australian National University says the metamaterials offer the flexibility needed to do this.
"One of the applications of metamaterials is this cloaking," he said.
"And the idea is that because you have these extra degrees of freedom with these metamaterials that you just can't get with normal materials, you can bend light in these weird and wonderful ways."
Unprecedented Use
Originally posted by another user
It is the first time these metamaterials have been used to hide a 3D object in infrared light.
Mr Ergin says scientists in the past have managed to hide 2D or 3D materials, but in different wavelengths such as microwaves, which are not visible to the human eye.
"We've built the first three-dimensional cloaking structure which works at the optical regime," he said.
"That is very close to visible light [although] it is not in the visible regime. It is still in the infrared, but it's not very far away.
"There have been experiments on these carpet cloak designs but they have been conducted in the microwave regime, for example, or also in the optical regime but only in the two-dimensional wave guide geometry."
Dr Powell says it is a significant step forward.
"All the other proof-of-principle experiments have just been two-dimensional, which is nice proof that the idea works," he said.
"But obviously we live in a three-dimensional world and you want to prove that this idea still can be feasible in three dimensions.
Mr Ergin says scientists in the past have managed to hide 2D or 3D materials, but in different wavelengths such as microwaves, which are not visible to the human eye.
"We've built the first three-dimensional cloaking structure which works at the optical regime," he said.
"That is very close to visible light [although] it is not in the visible regime. It is still in the infrared, but it's not very far away.
"There have been experiments on these carpet cloak designs but they have been conducted in the microwave regime, for example, or also in the optical regime but only in the two-dimensional wave guide geometry."
Dr Powell says it is a significant step forward.
"All the other proof-of-principle experiments have just been two-dimensional, which is nice proof that the idea works," he said.
"But obviously we live in a three-dimensional world and you want to prove that this idea still can be feasible in three dimensions.
Originally posted by another user
"It's done over a very wide range of wavelengths, so that means that of course we see a variety of wavelengths ourselves that corresponds to all the different colours we see.
"For a real cloak to work so that we can see something it would also have to work for a large number of wavelengths and that's actually quite an achievement."
Both scientists agree though that a Harry Potter-sized invisibility cloak is still many decades away.
Mr Ergin says his experiment was on a very small scale, with the bump on the gold mirror only visible under a microscope.
But he says the technology may have many more applications than simply hiding things.
He says these advances in optics could one day be used in telecommunications or computer technology or simply to further scientific knowledge.
"These invisibility cloaks are for us just [a] beautiful, exciting and thrilling benchmark, an example to see or to look into the fundamental principles of transformation optics," Mr Ergin said.
"For a real cloak to work so that we can see something it would also have to work for a large number of wavelengths and that's actually quite an achievement."
Both scientists agree though that a Harry Potter-sized invisibility cloak is still many decades away.
Mr Ergin says his experiment was on a very small scale, with the bump on the gold mirror only visible under a microscope.
But he says the technology may have many more applications than simply hiding things.
He says these advances in optics could one day be used in telecommunications or computer technology or simply to further scientific knowledge.
"These invisibility cloaks are for us just [a] beautiful, exciting and thrilling benchmark, an example to see or to look into the fundamental principles of transformation optics," Mr Ergin said.
So What Do You Guys Think?
Can It Be Made Or Not?
Source:
04-16-2011, 12:18 PM
#39
ResistTheSun
In Flames Much?
Originally posted by WhatsaN00B
I'm not attacking his area though?
But seriously, scientists that are creating an illusion, because that's all it is, an illusion, are getting more recognition than any breakthroughs in medicine.
Good on these guys for completing what they have, but MY opinion is that it isn't really a breakthrough for the human race, what the hell will invisibility be used for?
But seriously, scientists that are creating an illusion, because that's all it is, an illusion, are getting more recognition than any breakthroughs in medicine.
Good on these guys for completing what they have, but MY opinion is that it isn't really a breakthrough for the human race, what the hell will invisibility be used for?
Manufacturing certain materials which degrade under light to stop that getting a better result.
We are doing breakthroughs in medical areas just it alot harder and takes ages before it makes a impact.
Btw this is true and real
UK research groups was some of the first to do this.
04-18-2011, 07:39 AM
#40
Sempiternal
Previously uG~ Wounded
04-18-2011, 06:32 PM
#41
Winning
Former Staff
Originally posted by Iriish
I was simply using it as a figure of speach to emphasise how hard it is to think outside the box.
Not as hard as trying to think of a new color. I mean, you could theoretically think of new colors, but no one could see them. Thinking outside of the box is simply putting out ideas that people have already discarded and giving them enhancements.
04-18-2011, 08:32 PM
#42
Sempiternal
Previously uG~ Wounded
Originally posted by Winning
Not as hard as trying to think of a new color. I mean, you could theoretically think of new colors, but no one could see them. Thinking outside of the box is simply putting out ideas that people have already discarded and giving them enhancements.
I know that it is not as hard, but again i only used it to show that it is difficult.
My dad has come up with many many inventions for the abbey cbs grammar school and has won countless number of trophies coming 1st place 4/5 times.
He askes me to try to come up with a new invention but I could sit up to an hour exploring my mind thinking of what could be made that isn't already out there. I had no luck.
04-18-2011, 08:34 PM
#43
Winning
Former Staff
Originally posted by Iriish
I know that it is not as hard, but again i only used it to show that it is difficult.
My dad has come up with many many inventions for the abbey cbs grammar school and has won countless number of trophies coming 1st place 4/5 times.
He askes me to try to come up with a new invention but I could sit up to an hour exploring my mind thinking of what could be made that isn't already out there. I had no luck.
My dad has come up with many many inventions for the abbey cbs grammar school and has won countless number of trophies coming 1st place 4/5 times.
He askes me to try to come up with a new invention but I could sit up to an hour exploring my mind thinking of what could be made that isn't already out there. I had no luck.
That's what a great mind is for. You need great thinkers that can explore the true potential of their imagination :fyea:
The following user thanked Winning for this useful post:
04-18-2011, 08:39 PM
#44
Sempiternal
Previously uG~ Wounded
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