Tractor Beam Works Over Longer Distances

This new tractor beam prototype is able to move small objects 100x the size of a bacterium more than a meter using only the power of light. It was built by researchers from the Australian National University.


(Tractor beam suspends a small particle over an optics table. )

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.

Science fiction fans recall that the term tractor beam originated in Space Hounds of IPC, the 1931 novel by E.E. 'Doc' Smith.

...Brandon swung mighty tractor beams upon the severed halves of the Jovian vessel, then extended a couple of smaller rays to meet the two little figures racing across the smooth green meadow...
(Read more about Smith's tractor beam)

Although he lost the "war of words" with Smith, science fiction writer Edmond Hamilton had the basic idea first - he called it an "attractive ray" in his 1928 book Crashing Suns.

From via Physorg; thanks to Winchell Chung for the tip in this story.

Scroll down for more stories in the same category. (Story submitted 9/8/2010)

Follow this kind of news @Technovelgy.

| Email | RSS | Blog It | Stumble | del.icio.us | Digg | Reddit |

Would you like to contribute a story tip? It's easy:
Get the URL of the story, and the related sf author, and add it here.

Comment/Join discussion ( 0 )

Related News Stories - (" Space Tech ")

Is 'The Pulsar Positioning System' Evidence For SETI?
'For a hyperspace jump, you need at least four beacons for an accurate fix.' - Harry Harrison, 1959.

Are Observed Radio Bursts An Alien Propulsion Technology?
'These cones were driven through space by light pressure, the possibilities of which force they had long utilized.' - Edmond Hamilton, 1929.

Caltech's ET Laboratory Looks For New Earths
'...set my automatic astronomical instruments to searching for a habitable planet.'- Edmond Hamilton, 1936.

Shh! USAF's Secret X-37B Space Plane Breaks Record
'More airplane than spaceship...' - Robert Heinlein, 1951.

 

Google
  Web TechNovelgy.com   

Technovelgy (that's tech-novel-gee!) is devoted to the creative science inventions and ideas of sf authors. Look for the Invention Category that interests you, the Glossary, the Invention Timeline, or see what's New.

 

 

 

 

 

Current News

Cattle Avoidance Feature In Indian Autonomous Cars
'The driver went about the business of gently slipping the teflon-coated metal scoop beneath the first animal...'

Project KOVR Fashion Protection From Infosphere
'... the entire shroudlike membrane took on whatever physical characteristics were projected at any nanosecond.'

Twist Bioscience High Density Digital Data On DNA
'They tied the memory to the bloodline and that was their record!'

'We're Not Creating A Terminator' Say Russians About Gun-Wielding Robot Fedor
Nobody is thinking about the Terminator. Westworld, maybe.

Vantablack Now IMMEASURABLY Black
'a black coating now thatís ninety-nine percent absorptive...'

Mercedes-Benz Autonomous Taxi Fleet In 3 Years
'... the taxi utilized sophisticated electronic sensors to perceive its surroundings.'

Is 'The Pulsar Positioning System' Evidence For SETI?
'For a hyperspace jump, you need at least four beacons for an accurate fix.'

Someday, You Might Like VR Enough To Move In
'That barrier was going to melt away someday soon. The transhumanists had promised...'

Humans Use Mental Power For Turtle Slavery
Now we need to start looking for animals with fingers...

Solar-Powered Moisture Vaporator
'The atmosphere yielded its moisture with reluctance.'

DxtER! Tricorder Prize Won By Final Frontier Medical Devices
We've been waiting a long time for this, Star Trek fans.

President Trump's Wall As Otra Nation Hyperloop
'...an hollow tube must be constructed the whole distance... as to admit a four wheeled carriage...'

Pickup Lines From Artificial Intelligences
'They hate us, you know... The humans. They'll stop at nothing.'

Pooper Scooper Drone Robot Watchdog 1
'Robots pick up the garbage and junk...'

Cassie Robot Brings AT-ST Walker To Life
There's even a log test!

Hundreds Of Robot Lawnmowers Invade Texas Town
'The mower reached the edge of the lawn, clucked to itself...'

More SF in the News Stories

More Beyond Technovelgy science news stories

Home | Glossary | Invention Timeline | Category | New | Contact Us | FAQ | Advertise |
Technovelgy.com - where science meets fiction™

Copyright© Technovelgy LLC; all rights reserved.