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For the geek in you...

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Since I am an engineer, I'm always amazed when I see news like this, even though it sounds pretty geek.

Some people from the EPLF (École Polytechnique Fédérale de Lausanne) in Switzerland just managed to do a breakthrough in science.

They managed to manipulate light... make it slower... and even worst, they made it FASTER, which was supposed to by impossible :jawdrop:

here you go:

August 20, 2005
Swiss researchers have successfully demonstrated for the first time that it is possible to control the speed of light in an optical fiber.

On the screen, a small pulse shifts back and forth – just a little bit. But this seemingly unremarkable phenomenon could have profound technological consequences. It represents the success of Luc Thйvenaz and his fellow researchers in the Nanophotonics and Metrology laboratory at EPFL in controlling the speed of light in a simple optical fiber. They were able not only to slow light down by a factor of three from its well – established speed c of 300 million meters per second in a vacuum, but they've also accomplished the considerable feat of speeding it up – making light go faster than the speed of light.

This is not the first time that scientists have tweaked the speed of a light signal. Even light passing through a window or water is slowed down a fraction as it travels through the medium. In fact, in the right conditions, scientists have been able to slow light down to the speed of a bicycle, or even stop it altogether. In 2003, a group from the University of Rochester made an important advance by slowing down a light signal in a room-temperature solid. But all these methods depend on special media such as cold gases or crystalline solids, and they only work at certain well-defined wavelengths. With the publication of their new method, the EPFL team, made up of Luc Thйvenaz, Miguel Gonzalйz Herraez and Kwang-Yong Song, has raised the bar higher still. Their all-optical technique to slow light works in off-the-shelf optical fibers, without requiring costly experimental set-ups or special media. They can easily tune the speed of the light signal, thus achieving a wide range of delays.

"This has the enormous advantage of being a simple, inexpensive procedure that works at any wavelength, notably at wavelengths used in telecommunications," explains Thйvenaz.

The telecommunications industry transmits vast quantities of data via fiber optics. Light signals race down the information superhighway at about 186,000 miles per second. But information cannot be processed at this speed, because with current technology light signals cannot be stored, routed or processed without first being transformed into electrical signals, which work much more slowly. If the light signal could be controlled by light, it would be possible to route and process optical data without the costly electrical conversion, opening up the possibility of processing information at the speed of light.

This is exactly what the EPFL team has demonstrated. Using their Stimulated Brillouin Scattering (SBS) method, the group was able to slow a light signal down by a factor of 3.6, creating a sort of temporary "optical memory." They were also able to create extreme conditions in which the light signal travelled faster than 300 million meters a second. And even though this seems to violate all sorts of cherished physical assumptions, Einstein needn't move over – relativity isn't called into question, because only a portion of the signal is affected.

Slowing down light is considered to be a critical step in our ability to process information optically. The US Defense Advanced Research Projects Agency (DARPA) considers it so important that it has been funnelling millions of dollars into projects such as "Applications of Slow Light in Optical Fibers" and research on all-optical routers. To succeed commercially, a device that slows down light must be able to work across a range of wavelengths, be capable of working at high bit-rates and be reasonably compact and inexpensive.

The EPFL team has brought applications of slow light an important step closer to this reality. And Thйvenaz points out that this technology could take us far beyond just improving on current telecom applications. He suggests that their method could be used to generate high-performance microwave signals that could be used in next-generation wireless communication networks, or used to improve transmissions between satellites. We may just be seeing the tip of the optical iceberg.

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Could you repeat that please...in Lancashire Dialect!! :p

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Boring, isn't it? :lol:

To resume it, they managed to slow down the light and speed up a PORTION of the light signal.. which is a breakthrow because it's the first time they do it for cheap.. it will be another revolution in the telecom world in a few years...

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Thats fucked up. Where my dope at? Only way i can comprehend it.

Disclaimer: Drugs are bad for you.

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they made light FASTER???

:scratch:

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So.. are they any closer to moving objects at the speed of light???The breakthrough we all await,in our lifetime would be really something to behold

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Spotnick wrote: Boring, isn't it? :lol:

To resume it, they managed to slow down the light and speed up a PORTION of the light signal.. which is a breakthrow because it's the first time they do it for cheap.. it will be another revolution in the telecom world in a few years...

Nah, not boring at all. Fascinating. Thanks for posting!

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What Kind of Engineer are you Nick? Also - I forgot to ask after the Canadian Engineers badge you mentioned some time back. What is it?

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CAKE - CLOCK - ZWART wrote: What Kind of Engineer are you Nick? Also - I forgot to ask after the Canadian Engineers badge you mentioned some time back. What is it?

I thought he said RING.

I meant to ask about that too.

Come on Nic, show us yer ring!

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I'm still waiting for more news on the anti-graviton research (some scientists levitated some frogs a few years ago using some kind of prototype); that would revolutionise airflight and space exploration.

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Very interesting indeed, thanks Spot.

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How did they measure the speed of light in their experiments? :confused2:

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CAKE - CLOCK - ZWART wrote: What Kind of Engineer are you Nick? Also - I forgot to ask after the Canadian Engineers badge you mentioned some time back. What is it?

Computer engineer... as for the Canadian engineer ring, I answered you, but check out http://www.ironring.ca for more information...

I'm starting to really enjoy Wikipedia, here's a better page: http://en.wikipedia.org/wiki/Iron_ring

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bye, bye E=MC2?

(i don't know how to make a superscript 2 on here)

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Never really understood the units involved in that equation. I don't think this blows it away tho, although if C is NOT a constant but a locally variable phenomenon, mayhaps we need to work back from atomic research using known values for E and M from an atomic pile to see if C is C if you see.

Anyway, what I was going to say before your post caught my eye agentwood is....

Anyone ever see the guy who sent microwaves faster than light (and technically back in time depending on your frame of reference)?

Basically he had a Microwave(shit, how do you get a mu on a UK keyboard) source and a pair of detectors, the path between the source and one detector was clear vacum, the other detector had a brass bar in the way. He sent a pulse and it arrived at the brass obscured detector first, implying faster transit than in a vacum. His experiment was challenged by some smartass who said he'd proved nothing because no INFORMATION had been sent, so next time he modulated the signal with mozart and recorded the FTL version and sent it to this guy to silence him. That's as far as I heard the story I'm afraid.

But if we assume that light is always slowed (or at least RESISTED) by anything denser than vacum ( hence refraction for those who aren't keeping up), then maybe this experiment has revealed something of the often spoken of and never spotted tachyon one of which's properties is that the harder you resist it the faster it goes. Mayhps even photons and tachyons are freely interchangable under certain circumstances.

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They never exactly come clean about how they sped it up, do they? I understand the principal of slowing down the wavelength through filtering but can't get my head round where a filter could speed things up.:scratch:

Steve... interesting stuff. You must have been posting while I was typing.

If I read it correctly, they're slowing only a portion of the signal so is it also possible they've found a way to amplify part of the wavelength as well thus creating faster than light speed in the optical fiber? This'll keep me awake at night....

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i'm trying to remember my university astronomy class and the (few) books i've read on the subject (if i didn't suck in math, i'd be an astrophysicist). so here goes:

i always thought the speed of light was a constant in a vacuum. it only appears to change depending on one's reference point, i.e. the doppler effect. light can be slowed down when not in a vacuum, but not sped up.

however, as steve points out, tachyons are included in that part of particle physics that doesn't fit in with general physics, and we know that a lot of theories of quantum and particle physics don't jive with those of general, or classical physics (something which drove einstein up the wall).

i'm interested in seeing where the field of string theory will take us. when andrei sakharov spoke at my school in 1988 he was preparing for a conference at MIT at which they were going to discuss string theory and dimensions. he spoke of, if i remember correctly, 11 different dimensions! and then said, 'but you are all smart. i'm sure you can understand that concept quite easily.' we all laughed because most of what he was saying went right over our heads! still, it got me thinking about physics--even if i can't do the math involved to save my life.

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NPR had a story last week about some geeks that have learned how to store light.

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twist wrote: NPR had a story last week about some geeks that have learned how to store light.

damn, that would be nice. imagine what you could save on your electric bill?

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I think they were using this technology for possible data storeage.

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I've had a couple of pints in the "J.P. Joule". It's a pub in my home town named after..well, you know, who lived just round the corner from me about 3 billion years ago.

My question is if he is so smart and invented a unit of energy then why does the beer in his pub taste like shite? :scratch:

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there's a guy who works for the coors brewery who is the only person in america with a PhD in beer, and i've often wondered the same thing about him: if he has a PhD in beer and coors managed to hire him, you'd think they could produce something that tasted a little less like piss.

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unless he was hired specifically to make beer that tastes like piss?

But not early morning dehydrated brown piss, of Coors.

:sick:

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Barney Army wrote: unless he was hired specifically to make beer that tastes like piss?

But not early morning dehydrated brown piss, of Coors.

:sick:

he was schooled in belgium...you'd think he'd know a little better.

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Spotnick wrote:

CAKE - CLOCK - ZWART wrote: What Kind of Engineer are you Nick? Also - I forgot to ask after the Canadian Engineers badge you mentioned some time back. What is it?

Computer engineer... as for the Canadian engineer ring, I answered you, but check out http://www.ironring.ca for more information...

I'm starting to really enjoy Wikipedia, here's a better page: http://en.wikipedia.org/wiki/Iron_ring

I want one of those!

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