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Helium Ion Microscopy Goes Through Paces

September 10th, 2008 Medgadget Editors News


Researchers at the National Institute of Standards and Technology are conducting extensive test on the capabilities of the first commercial helium ion microscope, a device we covered last September, representing a new way to image on the very small scale that will be competing against traditional scanning electron microscopes.

This new microscope technology uses helium ions to generate the signal used to image extremely small objects, a technique analogous to the scanning electron microscope, which was first introduced commercially in the 1960s. Paradoxically, although helium ions are far larger than electrons, they can provide higher resolution images with higher contrast. The depth of field is much better with the new technology too, so more of the image is in focus. “It is the physics,” explains Andras Vladar, SEM project leader in NIST’s Nanoscale-Metrology Group. “Ions have larger mass and shorter wavelength than electrons, so they can be better for imaging.” The images, he says, appear almost three-dimensional, revealing details smaller than a nanometer—the distance spanned by only three atoms in the silicon crystal.
NIST is working to understand the imaging mechanisms of this new technology. The clearest advantage of the helium ion microscope is that the images show the actual edge of a sample better than the SEM, which is critical in precision manufacturing. “Meeting critical dimensions by knowing where an edge is in high-tech manufacturing can mean the difference of hundreds of dollars per piece,” explains Michael Postek, chief of the NIST Precision Engineering Division and the nanomanufacturing program manager. Semiconductor manufacturers have multi-million dollar scanning electron microscopes all along their production lines to help control their microchip manufacturing processes.
NIST received the first-ever commercial helium ion microscope, called Orion, from Carl Zeiss, Inc., last summer as part of a cooperative research and development agreement (CRADA). Researchers are test-piloting it in NIST’s Advanced Measurement Laboratory (AML), one of the most environmentally stable research facilities in the world. Carefully controlled for vibration, humidity and temperature changes, AML labs are optimal sites to test new microscope technology, say the researchers.

Press release: NIST Studies How New Helium Ion Microscope Measures Up
Image: An image of gold atoms on tin from a state-of-the-art scanning electron microscope (left) has relatively poor depth of field-only parts of the image are in sharp focus. By contrast, the entire image from a helium ion microscope image (right) is sharp and clear.
Flashback: The Orion Helium Ion Microscope

Medgadget Editors

Medical technologies transform the world! Join us and see the progress in real time. At Medgadget, we report the latest technology news, interview leaders in the field, and file dispatches from medical events around the world since 2004.

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