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Removing Beam Current Artifacts in Helium Ion Microscopy: A Comparison of Image Processing Techniques

Published online by Cambridge University Press:  13 September 2016

Anders J. Barlow Open the ORCID record for Anders J. Barlow [Opens in a new window] ,
Jose F. Portoles ,
Naoko Sano  and
Peter J. Cumpson
Anders J. Barlow*
Affiliation:
National EPSRC XPS Users’ Service (NEXUS), School of Mechanical and Systems Engineering, Newcastle University, Newcastle upon Tyne, Tyne and Wear, NE1 7RU, UK
Jose F. Portoles
Affiliation:
National EPSRC XPS Users’ Service (NEXUS), School of Mechanical and Systems Engineering, Newcastle University, Newcastle upon Tyne, Tyne and Wear, NE1 7RU, UK
Naoko Sano
Affiliation:
National EPSRC XPS Users’ Service (NEXUS), School of Mechanical and Systems Engineering, Newcastle University, Newcastle upon Tyne, Tyne and Wear, NE1 7RU, UK
Peter J. Cumpson
Affiliation:
National EPSRC XPS Users’ Service (NEXUS), School of Mechanical and Systems Engineering, Newcastle University, Newcastle upon Tyne, Tyne and Wear, NE1 7RU, UK
*
*Corresponding author. [email protected]
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Abstract

The development of the helium ion microscope (HIM) enables the imaging of both hard, inorganic materials and soft, organic or biological materials. Advantages include outstanding topographical contrast, superior resolution down to <0.5 nm at high magnification, high depth of field, and no need for conductive coatings. The instrument relies on helium atom adsorption and ionization at a cryogenically cooled tip that is atomically sharp. Under ideal conditions this arrangement provides a beam of ions that is stable for days to weeks, with beam currents in the order of picoamperes. Over time, however, this stability is lost as gaseous contamination builds up in the source region, leading to adsorbed atoms of species other than helium, which ultimately results in beam current fluctuations. This manifests itself as horizontal stripe artifacts in HIM images. We investigate post-processing methods to remove these artifacts from HIM images, such as median filtering, Gaussian blurring, fast Fourier transforms, and principal component analysis. We arrive at a simple method for completely removing beam current fluctuation effects from HIM images while maintaining the full integrity of the information within the image.

Keywords

helium ion microscopydestripingFFTPCASVD
Type
Instrumentation and Techniques Development
Information
Microscopy and Microanalysis , Volume 22 , Issue 5 , October 2016 , pp. 939 - 947
Copyright
© Microscopy Society of America 2016 

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