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Gingersnap
09-08-2010, 10:42 AM
Scientists Invent a Tractor Beam

By Mike Lucibella

Published September 08, 2010

http://i53.tinypic.com/xd5u81.jpg
Australian National University
A tractor beam in action suspends a small particle over an optics table.

WASHINGTON Tractor beams, energy rays that can move objects, are a science fiction mainstay. But now they are becoming a reality -- at least for moving very tiny objects.

Researchers from the Australian National University have announced that they have built a device that can move small particles a meter and a half using only the power of light.

Physicists have been able to manipulate tiny particles over miniscule distances by using lasers for years. Optical tweezers that can move particles a few millimeters are common.

Andrei Rhode, a researcher involved with the project, said that existing optical tweezers are able to move particles the size of a bacterium a few millimeters in a liquid. Their new technique can move objects one hundred times that size over a distance of a meter or more.

The device works by shining a hollow laser beam around tiny glass particles. The air surrounding the particle heats up, while the dark center of the beam stays cool. When the particle starts to drift out of the middle and into the bright laser beam, the force of heated air molecules bouncing around and hitting the particle's surface is enough to nudge it back to the center.

A small amount of light also seeps into the darker middle part of the beam, heating the air on one side of the particle and pushing it along the length of the laser beam. If another such laser is lined up on the opposite side of the beam, the speed and direction the particle moves can be easily manipulated by changing the brightness of the beams.

Rhode said that their technique could likely work over even longer distances than they tested.

"With the particles and the laser we use, I would guess up to 10 meters in air should not be a problem. The max distance we had was 1.5 meters, which was limited by the size of the optical table in the lab," Rhode said.

Very cool!

Fox News (http://www.foxnews.com/scitech/2010/09/08/tractor-beams-real/?test=latestnews)

Rockntractor
09-08-2010, 10:44 AM
How long to a holodeck, I have a right to a holodeck!:mad:

obx
09-08-2010, 10:49 AM
..and it comes in John Deere Green.
________
New Mexico Dispensaries (http://newmexico.dispensaries.org/)

Bailey
09-08-2010, 11:00 AM
How long to a holodeck, I have a right to a holodeck!:mad:

The day they make them is the day the Human race goes extent, you couldnt pry me out of one. :D

bijou
09-08-2010, 11:23 AM
How long to a holodeck, I have a right to a holodeck!:mad:

It'll be along right after Ginger's dog friendly jetpack. :D

Nubs
09-08-2010, 11:56 AM
..and it comes in John Deere Green.

Depending on the gas used, you could have any color you want. If you use CO2, it would be invisible. In this case they are using argon.

PoliCon
09-08-2010, 12:40 PM
..and it comes in John Deere Green.

well it is a tractor beam!

FlaGator
09-08-2010, 01:25 PM
How long to a holodeck, I have a right to a holodeck!:mad:

Just do it the old fashion way... masturbate and think of Betty White.

Rockntractor
09-08-2010, 02:33 PM
Just do it the old fashion way... masturbate and think of Betty White.

Oh crap, that would turn it into an inboard!:eek:

Sonnabend
09-09-2010, 09:04 AM
Just do it the old fashion way... masturbate and think of Betty White. http://static.tvtropes.org/pmwiki/pub/images/th_brain_bleach.jpg

DJ, in your case I will forego the tar and feathers.

THIS TIME :mad:





















:D:D

marv
09-09-2010, 09:44 AM
Won't work in space........but the concept of a hollow laser beam is interesting.

SarasotaRepub
09-09-2010, 09:25 PM
http://rlv.zcache.com/engage_tractor_beam_tshirt-p235389037381751190trlf_400.jpg


:D

Rockntractor
09-09-2010, 09:39 PM
You could mount one of these tractor beam lasers on your pistol and pull them in nice and close and blow them away!:D