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[BBC] 'Tractor beam' is possible with lasers, say scientists

post #1 of 9
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Quote:
A laser can act as a "tractor beam", drawing small objects back toward the laser's source, scientists have said.

It is known that light can provide a "push", for example in solar sails that propel spacecraft on a "wind of light".

Now, in a paper on the Arxiv server, researchers from Hong Kong and China have calculated the conditions required to create a laser-based "pull".
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post #2 of 9
Do want.
    
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post #3 of 9
Beam me up Scotty
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post #4 of 9

I think this is related to optical trapping.


I have also read several scientific papers where "optical tweezers" are used to hold DNA in place in experiments. Lasers rock.
    
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post #5 of 9
Quote:
Originally Posted by Versa View Post
Beam me up Scotty
He never said that
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post #6 of 9
Quote:
Originally Posted by Epitope View Post
I think this is related to optical trapping.

http://www.youtube.com/watch?v=4awR7JwvxCc

I have also read several scientific papers where "optical tweezers" are used to hold DNA in place in experiments. Lasers rock.
Is that sharpie on fire? That's cool though.
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post #7 of 9
Quote:
Originally Posted by HybridCore View Post
Is that sharpie on fire? That's cool though.
Sort of. The laser is strong enough to burn a small amount of material off the felt tip. The burnt material is then optically trapped in the laser beam. The tractor beam would work on a related fashion only it would be able to pull the object closer.
    
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post #8 of 9
What I wanna know is, even with tractor beams how do the aliens get us out of our homes to probe us? They must have some sort of phase shift tractor beams those cheeky bastards.
post #9 of 9
Awesome video above

Quote:
Originally Posted by SIMPSONATOR View Post
He never said that
But he did. lol
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Overclock.net › Forums › Industry News › Technology and Science News › [BBC] 'Tractor beam' is possible with lasers, say scientists