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Nanoscale dimensioning is fast, cheap with new NIST optical technique
Date:10/29/2008

A novel technique* under development at the National Institute of Standards and Technology (NIST) uses a relatively inexpensive optical microscope to quickly and cheaply analyze nanoscale dimensions with nanoscale measurement sensitivity. Termed Through-focus Scanning Optical Microscope (TSOM) imaging, the technique has potential applications in nanomanufacturing, semiconductor process control and biotechnology.

Optical microscopes are not widely considered for checking nanoscale (below 100 nanometers) dimensions because of the limitation imposed by wavelength of lightyou cant get a precise image with a probe three times the objects size. NIST researcher Ravikiran Attota gets around this, paradoxically, by considering lots of bad (out-of-focus) images. This imaging uses a set of blurry, out-of-focus optical images for nanometer dimensional measurement sensitivity, he says. Instead of repeatedly focusing on a sample to acquire one best image, the new technique captures a series of images with an optical microscope at different focal positions and stacks them one on top of the other to create the TSOM image. A computer program Attota developed analyzes the image.

While Attota believes this simple technique can be used in a variety of applications, he has worked with two. The TSOM image can compare two nanoscale objects such as silicon lines on an integrated circuit. The software subtracts one image from the other. This enables sensitivity to dimensional differences at the nanoscaleline height, width or side-wall angle. Each type of difference generates a distinct signal.

TSOM has also been theoretically evaluated in another quality control application. Medical researchers are studying the use of gold nanoparticles to deliver advanced pharmaceuticals to specific locations within the human body. Perfect size will be critical. To address this application, a TSOM image of a gold nanoparticle can be taken and compared to a library of sim
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Contact: Evelyn Brown
evelyn.brown@nist.gov
301-975-5661
National Institute of Standards and Technology (NIST)
Source:Eurekalert  

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Nanoscale dimensioning is fast, cheap with new NIST optical technique
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