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Posted: Jun 28, 2012

Now we're seeing the small picture - a new imaging method for atoms

(Nanowerk News) A new high-tech method for imaging the electric fields of atoms could lead to advances in areas as diverse as data storage, solar cells and batteries.
Research published today in the prestigious journal Nature Physics ("Differential phase-contrast microscopy at atomic resolution") detailed how physicists from Monash University and Japanese institutions including the University of Tokyo and the Japan Science and Technology Agency viewed the electric fields of atoms using a new advanced scanning transmission electron microscopy technique.
scanning transmission electron microscope
The scanning transmission electron microscope used in the experiment and a conceptual depiction of the new technique.
Electric fields are produced by the electrically-charged particles within atoms known as protons and electrons. The electrical forces between the positively and negatively charged particles play an important structural role - they hold the atoms together.
By visualising the pattern of the fields produced by these charges, scientists will gain further insight into the electrical properties of materials. For instance, being able to manufacture electric field patterns on small length scales is a route to high capacity data storage.
Co-author Dr Scott Findlay of Monash University's School of Physics said the technique he developed with his Japanese colleagues was a breakthrough.
"Electron microscopy is a fast-developing field. Recent advances have let us see where individual atoms sit in a material, but it has been much harder to see their electric fields," Dr Findlay said.
The new technique allows the researchers to view electric field patterns by the deflections they induced in a beam of electrons.
"Itís like rolling marbles to look for slight slopes in the ground. If the marble deflects to the left, that must be downhill; if the beam of electrons deflects to the left, that must be the direction the field points," Dr Findlay said.
Dr Findlay said that viewing materials on the atomic level gave an entirely new perspective.
"We're seeing things that we've never seen before. Understanding the behaviour of materials and their electric fields on a very small scale expands what we are able to do with them," Dr Findlay said.
A number of groups internationally had been working on picturing electric fields. Dr Findlay will continue to work with collaborators in Japan to further refine their technique and apply it to developing new materials.
Source: Monash University
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