Scientists
have made a hole in time. Brian Handwerk at National Geographic News: Einstein's theories of relativity suggest
that gravity can cause time to slow down. Now scientists have demonstrated a
way to stop time altogether—or at least, to give the appearance of time
stopping by bending light to create a hole in time.
The new
research builds on recent demonstrations of "invisibility cloaks"
that can make objects seem to disappear by bending waves of visible light.
The idea is
that, if light moves around an object instead of striking it, that light
doesn't get scattered and reflected back to an observer, making the object
essentially invisible.
Now Cornell
University scientists have used a similar concept to create a hole in time,
albeit a very short one: The effect lasts around 40 trillionths of a second.
"Imagine
that you could divert light in time—slow it down, speed it up—so that you
create a gap in the light beam in time," said study co-author and Cornell
physicist Alex Gaeta.
"In this
case, any event that occurs at that instant of time won't lead to scattering of
light. It appears as if the event never occurred."
For example,
Gaeta said, think of laser beams crisscrossing a museum display to protect
priceless works of art.
"You have
a laser beam and a detector set up to detect when all of a sudden the beam is
broken and there is no light. So if you pass through that beam, an alarm goes
off," he said. "But what if a
device would perhaps speed up a portion of the beam and slow down another
portion of it so that there is an instant of time with no beam. You could pass
through, and then [on the other side of the event] the device would do the
opposite—speed up the part that had been slowed and slow the part that had been
sped up," he explained. That would
put the beam of light back together, so to speak, so the detector would never
recognize that anything had happened."
Hmm, where do I sign-up?
8 comments:
Researchers are nowhere near developing the technology seen in H.G. Wells's 'Invisible Man.' But they are getting closer.
We’ll believe it when we see it—or rather, don’t see it—but scientists from Tufts and Boston University claim to have invented the world’s first pliable invisibility cloak. Made from silk and coated in gold, the visibility-challenged outerwear still requires some tweaking before it’s ready to enable Hogwarts-style hijinks: the new metamaterial only works at terahertz frequencies between radio and infrared light on the electromagnetic spectrum, according to a paper published in an issue of Advanced Materials.
Even if you can just slightly bend light to your advantage most people won’t see you. A few years ago we had a huge airsoft game going and someone had made a ghili suit to try out. He was so hard to see one of his team mates stepped on him! ;-0
When you find out please let me know(sign-up).
great theory. i encourage looking into it further.
but i have to comment. its very complicated
always renember KISS
In the names of Harry Potter and the Predator, let's hope that Moore's Law successfully applies to rods, meta material, and lasers, and not just to microchips and processors.
Until engineers find a way around all the obstacles, true invisibility will remain just out of reach. So relax: The men in black aren't leaning over your shoulder as you read this. Still, the tech is physically possible and likely on its way. As is the obvious countermeasure: a balloon full of screaming yellow paint.
I already have one, but I can't see where I left it!
"We may be seeing Harry Potter's invisibility suit sooner than we think?"
Not if it works, we won't.
I think I'm going back into the defence trade...Of to the MoD to show them my new DPM combat uniform which makes soldiers invisible.
"But I can't see anyone!"
"No! He's completely invisible!"
"That's marvellous! Here's your cheque.”
"Ta very much but can I have cash instead? I've got a flight to Zurich in fifteen minutes..."
"Both of you?"
"No. Just me.”
You've got my size Charles.
Send one NOW!
Danke Karl for the advise.
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