Metamaterials and The Science of Invisibility | John Pendry | TEDxImperialCollege

Ah, invisibility, that holy grail of physics and invention. In this stimulating talk, Prof John Pendry shares with us a history of the science of invisibility, and some exciting prototypical invisibility cloaks that have been made so far.
Prof. Sir John Pendry is a professor of theoretical solid
state physics at Imperial College London and is one of
the pioneers in the field of metamaterials. These are
engineered materials with properties not found
anywhere in nature. He is most well known for his work
on the “cloak of invisibility.” He has been awarded
numerous awards such as the Newton medal for his
research and in his talk, Prof. Pendry will tell us about
the science of invisibility.
This talk was given at a TEDx event using the TED conference format but independently organized by a local community. Learn more at ted.com/tedx

[@starguy2718]

Soon (this year, perhaps), Sir John Pendry will receive the Nobel Prize in Physics, for inventing metamaterials in 1999.

[@TheRiboka]

Why was this being widely discussed up until 5 years ago and then the influx of information bout this on KZbin kind of stops? Did they hit a wall in developing these things? I would have expected a live demonstration of this by now

[@dennissmith6373]

It takes the right kind of person to communicate an idea orally, this guy is not one of those kind of teachers.

[@polarizadmax]

It takes right kind of student to understand what concept sir john pendry is explaining. Beside the word cloaking, one need to know basic physics to understand it.

[@dennissmith6373]

Ok

[@dennissmith6373]

Name anything that does not "respond" to gravity ?

[@Ashley-1917]

@Tyke Miiceon Thats not true. Antimatter is just regular matter but with opposite charge. It behaves similarly to regular matter in that it has a positive mass, takes up volume and follows all the same known laws of physics. This includes gravity.

[@godschildmuchluv25]

I would love one., It can really come in handy..

[@dishabandyopadhyay2051]

Wouldn't making holes in the glass cause diffraction?

[@ultimatequantumguy3131]

Not if they're beneath half the wavelength of the light - this is known as the diffraction limit.

[@Vshamann336]

Boy it seems like this is going to be a holy Grail and I'm wondering where everybody's going to do when you say that we can perform alchemy and turn this left the gold

[@kokomanation]

Lenticular lenses bend light really well

[@marmalade4835]

I do not get the part where he starts explaining the sphere and space inside. Can someone explain.

[@polarizadmax]

Read how eyes sees an object (due to reflection) but if object won’t reflect anything then it would be dark. Now imagine a cylinder which is capable to bend the light across it due to its property/construction.

[@polarizadmax]

That cylinder won’t reflect light but make it appear like reflected from somewhere else which our eye perceive as invisibility.

[@wahkaoz]

anybody from TRCH to Meta give me a 5!

[@dvhqlifestyle1219]

To the moon 😂

[@mikelazar8061]

George better give us an invisibly cloat

[@5600hp]

Same here . Trying to understand meta materials.

[@gene4094]

This negative refractive index has a possibility of splitting water into hydrogen and oxygen. These hydrogen and oxygen could be recombined in a combustion reaction for energy. The reactions need to take place at the sub-micro level. The radiation would also need shielding. Just some thoughts.

[@pidaras_pidarasina]

How you come to this conclusion?

[@erickgoourbr9164]

So funk pancadas

[@trippytimesjosh355]

My friends Chris and Ryan Bledsoe were allowed to hold meta material. It sent a surge of energy through them. Lue Elizondo himself came to pick it up from them. Confirmed it on a Spotify podcast.

[@spearshaker7974]

They surprised us so much because they are from aliens.

[@R3ptile]

If you believe Bob Lazars story then if he’s correct then the gravity based system on the flying saucer he describes bends light because gravity can bend space and time. These three things are interchangeable.

[@fractalantennas3241]

It is fatuous to make allusions to gravitational lenses. This has nothing to do with metamaterials. It just confuses people. The fact that invariant warping algorithms exist, mathematically, does not give one permission to tie in two unrelated physical phenomena. I don't see any evidence that Dr. Pendry has any background in gravitational lensing. Please post peer-reviewed references if he does.

[@amarug]

Fractal Antennas.. errhhh

[@yamiyugi8123]

🔋

[@ultimatequantumguy3131]

He's not arguing that they are two strongly related physical concepts, he's using one as an analogy for another to explain it to people with little/no knowledge in the field. I suspect you're missing the point of TEDx talks - and specifically their target market - he's not trying to speak to professionals. I must say that, personally, I found the idea of relating refraction to deformation of space far more useful in understanding continuously variant refractive indices than most other analogies. Please remember, just because you are intelligent does not mean that you are the only valid target market for a talk. Oh, and one does not necessarily require the publishing of peer-reviewed papers to have a basic understanding of a topic.

[@hamzao3359]

Mind your talk peasant. It's SIR Pendry for you. He is a knight, and you would best remember that you great supine protoplasmic invertebrate jelly.

[@artiompolyakov6776]

Какой же душный чел, это просто шок

[@tombrady7390]

HE only helped develop metamaterials

[@dotanwolf5640]

he could have skipped the nonsense and stick to refraction. there is no gravitational lensing...people can be so blind. they look thru a telescope which work on refraction and believe they see gravity bend light....how dumber can we get?

[@felixbarker4400]

how dumber can we get? lol nice

[@defenestrator9119]

Observations of stars as they moved in the background close to solar eclipses has confirmed that gravity bends light. As the stars move close to the Sun, their apparent position is altered so that they appear to move closer to the Sun as they move past and do a little wiggle as they move. This is because the Sun is bending the light's path as passes. We had to do this during solar eclipses because otherwise the Sun's intensity blocks us from seeing the stars as they pass so close.

[@defenestrator9119]

To get technical... it's not even bending the light. It's bending the space that the light is moving through. Techinically the light is still moving straight, but through curved space/time.

[@Lakupeep]

You don't have any clue what you're talking about. "There is no gravitational lensing" ?