Video | Business Headlines | Internet | Science | Scientific Ethics | Technology | Search

 


Otago physicists split and collide ultracold atom clouds

Tuesday 1 April 2014

Otago physicists split and collide ultracold atom clouds

University of Otago physicists have pushed the frontiers of quantum technology by developing a steerable ‘optical tweezers’ unit that uses intense laser beams to precisely split minute clouds of ultracold atoms and to smash them together.

The Otago researchers’ feat is set to enhance efforts to understand the mysterious ways that atoms interact at temperatures of less than a millionth of a degree above absolute zero. Its potential applications include new tools for probing microscopic structures or for sensors that can map minute variations in magnetic fields, says lead researcher Dr Niels Kjaergaard.

A description of their cutting-edge system is published in the April 1 issue of the US journal Optics Letters. It details an experiment in which the researchers used the technology to split a single ultracold cloud of rubidium atoms sequentially into 32 daughter clouds, spreading them out over nearly half a centimetre.

“This sort of precise control of these atoms is like being able to pull a delicate snowflake into two clean halves with your bare hands. It’s quite remarkable that we are able to manipulate such minute and fragile samples while moving them such a comparatively large distance,” Dr Kjaergaard says.

The experimental setup involves steering horizontal and vertical laser beams around through their interaction with precisely controlled travelling acoustic waves. These steerable laser beams confine and move the atoms. As well as splitting atom clouds, the system allows them to be collided.

“Tongue-in-cheek, we like to refer to our setup as the ‘Littlest Hadron Collider’. In some ways it’s the complete opposite of what is the world’s largest and most powerful particle collider, because instead of using extreme acceleration, we smash our atom clouds together at a pedestrian pace of up to a metre per second,” Kjaergaard says.

The steerable optical tweezers unit was constructed as part of Kris Roberts’ Honour’s thesis project in Dr Kjaergaard’s research group at the Jack Dodd Centre for Quantum Technology at the Department of Physics, while the control system for the acoustic waves was built by Master’s student Thomas McKellar.

“For researchers who are still students, these are quite notable achievements and I’m very proud of their work. It demonstrates the fantastic training opportunities that Otago can offer in its Physics programme,” Dr Kjaergaard says.

Kris is now a Master’s student in Dr Kjaergaard’s research group. The group’s work on the tweezers system is funded through a Marsden Fund of New Zealand grant.

QuickTime movies demonstrating capabilities of the optical tweezers unit:

• Splitting atomic clouds with laser tweezers

• 'Littlest hadron collider' at work

• The videos can also be viewed on this page: http://www.eurekalert.org/pub_releases/2014-03/uoo-nzp033114.php

© Scoop Media

 
 
 
 
 
Business Headlines | Sci-Tech Headlines

 

Company Results: Air NZ Rides The Tourism Boom With Record Full-Year Earnings

Air New Zealand has ridden the tourism boom and staved off increased competition to deliver the best full-year earnings in its 76-year history. More>>

ALSO:

New PGP: Sheep Milk Industry Gets $12.6M Crown Funding

The Sheep - Horizon Three programme aims to develop "a market driven, end-to-end value chain generating annual revenues of between $200 million and $700 million by 2030," according to a joint statement. More>>

ALSO:

Half Full: Fonterra Raises Forecast Milk Price

Fonterra Co-operative Group Limited today increased its 2016/17 forecast Farmgate Milk Price by 50 cents to $4.75 per kgMS. When combined with the forecast earnings per share range for the 2017 financial year of 50 to 60 cents, the total payout available to farmers in the current season is forecast to be $5.25 to $5.35 before retentions. More>>

ALSO:

Keep Digging: Seabed Ironsands Miner TransTasman Tries Again

The first company to attempt to gain a resource consent to mine ironsands from the ocean floor in New Zealand's Exclusive Economic Zone has lodged a new application containing fresh scientific and other evidence it hopes will persuade regulators after their initial application was turned down in 2014. More>>

Wool Pulled: Duvets Sold As ‘Premium Alpaca’ Mostly Sheep’s Wool

Rotorua business Budge Collection Limited (Budge) and sole director, Sun Dong Kim, were convicted and fined a total of $71,250 in Auckland District Court after each pleading guilty to four charges of misrepresenting how much alpaca fibre was in their duvets. More>>

Reserve Bank: Labour Calls For Monetary Policy To Expand Goals

Labour's comments follow a speech today by RBNZ governor Graeme Wheeler in which Wheeler sought to answer critics who variously say he should stop lowering interest rates, lower them faster, or that inflation-targeting should no longer be the primary goal of the central bank's activities. More>>

ALSO:

BSA Extension And Sunday Morning Ads: Digital Convergence Bill Captures Online Content

Broadcasting Minister Amy Adams has today announced the Government’s plans to update the Broadcasting Act to better reflect today’s converged market... The Government considered four areas as part of its review into content regulation: classification requirements, advertising restrictions, election programming and contestable funding. More>>

ALSO:

Get More From Scoop

 
 
 
 
 
 
 
 
 
Sci-Tech
Search Scoop  
 
 
Powered by Vodafone
NZ independent news