Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > Press > Laser makes microscopes way cooler: Cooling a nanowire probe with a laser could lead to substantial improvements in the sensitivity of atomic force probe microscopes

Ph.D. students Giovanni Guccione (left) and Harry Slatyer examine their gold coated nanowire probe in the Quantum Optics Laboratory at the Australian National University.

Credit: ANU Quantum Optics Group
Ph.D. students Giovanni Guccione (left) and Harry Slatyer examine their gold coated nanowire probe in the Quantum Optics Laboratory at the Australian National University.

Credit: ANU Quantum Optics Group

Abstract:
Laser physicists have found a way to make atomic-force microscope probes 20 times more sensitive and capable of detecting forces as small as the weight of an individual virus.

Laser makes microscopes way cooler: Cooling a nanowire probe with a laser could lead to substantial improvements in the sensitivity of atomic force probe microscopes

Canberra, Australia | Posted on August 15th, 2014

The technique, developed by researchers at The Australian National University (ANU), hinges on using laser beams to cool a nanowire probe to minus 265 degrees Celsius.

"The level of sensitivity achieved after cooling is accurate enough for us to sense the weight of a large virus that is 100 billion times lighter than a mosquito," said Dr Ben Buchler from the ANU Research School of Physics and Engineering.

The development could be used to improve the resolution of atomic-force microscopes, which are the state-of-the-art tool for measuring nanoscopic structures and the tiny forces between molecules.

Atomic force microscopes achieve extraordinarily sensitivity measurements of microscopic features by scanning a wire probe over a surface.

However, the probes, around 500 times finer than a human hair, are prone to vibration.
"At room temperature the probe vibrates, just because it is warm, and this can make your measurements noisy," said Professor Ping Koy Lam, a co-author of the research that is published in Nature Communications.

"We can stop this motion by shining lasers at the probe," he said.

The force sensor used by the ANU team was a 200 nm-wide silver gallium nanowire coated with gold.

"The laser makes the probe warp and move due to heat. But we have learned to control this warping effect and were able to use the effect to counter the thermal vibration of the probe," said Giovanni Guccione, a PhD student on the team.

However, the probe cannot be used while the laser is on as the laser effect overwhelms the sensitive probe. So the laser has to be turned off and any measurements quickly made before the probe heats up within a few milliseconds. By making measurements over a number of cycles of heating and cooling, an accurate value can be found.

"We now understand this cooling effect really well," says PhD student Harry Slatyer. "With clever data processing we might be able to improve the sensitivity, and even eliminate the need for a cooling laser."

####

For more information, please click here

Contacts:
Dr. Ben Buchler

61-261-259-973

Copyright © Australian National University

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Remote-control shoots laser at nano-gold to turn on cancer-killing immune cells April 20th, 2018

New qubit now works without breaks: A universal design for superconducting qubits has been created April 19th, 2018

Observing biological nanotransporters: Chemistry April 19th, 2018

Salt boosts creation of 2-D materials: Rice University scientists show how salt lowers reaction temperatures to make novel materials April 18th, 2018

Individual impurity atoms detectable in graphene April 18th, 2018

Imaging

Grand Opening of UC Irvine Materials Research Institute (IMRI) to Spotlight JEOL Center for Nanoscale Solutions: Renowned Materials Scientists to Present at the 1st International Symposium on Advanced Microscopy and Spectroscopy (ISAMS) April 18th, 2018

Individual impurity atoms detectable in graphene April 18th, 2018

Discoveries

Remote-control shoots laser at nano-gold to turn on cancer-killing immune cells April 20th, 2018

New qubit now works without breaks: A universal design for superconducting qubits has been created April 19th, 2018

Observing biological nanotransporters: Chemistry April 19th, 2018

Salt boosts creation of 2-D materials: Rice University scientists show how salt lowers reaction temperatures to make novel materials April 18th, 2018

Announcements

Remote-control shoots laser at nano-gold to turn on cancer-killing immune cells April 20th, 2018

New qubit now works without breaks: A universal design for superconducting qubits has been created April 19th, 2018

Observing biological nanotransporters: Chemistry April 19th, 2018

Salt boosts creation of 2-D materials: Rice University scientists show how salt lowers reaction temperatures to make novel materials April 18th, 2018

Tools

Observing biological nanotransporters: Chemistry April 19th, 2018

Grand Opening of UC Irvine Materials Research Institute (IMRI) to Spotlight JEOL Center for Nanoscale Solutions: Renowned Materials Scientists to Present at the 1st International Symposium on Advanced Microscopy and Spectroscopy (ISAMS) April 18th, 2018

Individual impurity atoms detectable in graphene April 18th, 2018

HTA to Present European Strategy for Competitive Micro- and Nanotechnologies & Smart Systems: Special Event in Brussels on April 24 Gathers Research Institutesí CEOs, European Commissioners and Key European Industrials April 17th, 2018

Photonics/Optics/Lasers

Doing the nano-shimmy: New device modulates light and amplifies tiny signals April 12th, 2018

Phononic SEIRA -- enhancing light-molecule interactions via crystal lattice vibrations April 10th, 2018

High-speed and on-silicon-chip graphene blackbody emitters: Integrated light emitters for optical communications April 5th, 2018

Leti Silicon Photonics Design Kit Available in Synopsis OptoDesigner Suite: Kit Contains Design Rules and Building Blocks for Multi-Project Wafers And Custom Runs on Letiís Si310 Platform April 5th, 2018

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project