Nanoscale structuring of tungsten tip yields most coherent electron point-source

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DOIResolve DOI: http://doi.org/10.1088/1367-2630/15/7/073038
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TypeArticle
Journal titleNew Journal of Physics
ISSN1367-2630
Volume15
Article number73038
SubjectCoherence properties; Emission current; Extraction voltage; High-aspect ratio; Holographic measurement; Low energy electrons; Point source microscopes; Virtual sources; Aspect ratio; Electrons; Optical microscopy; Tungsten
AbstractThis report demonstrates the most spatially-coherent electron source ever reported. A coherence angle of 14.3 ± 0.5° was measured, indicating a virtual source size of 1.7 ± 0.6 Å using an extraction voltage of 89.5 V. The nanotips under study were crafted using a spatially-confined, field-assisted nitrogen etch which removes material from the periphery of the tip apex resulting in a sharp, tungsten-nitride stabilized, high-aspect ratio source. The coherence properties are deduced from holographic measurements in a low-energy electron point source microscope with a carbon nanotube bundle as sample. Using the virtual source size and emission current the brightness normalized to 100 kV is found to be 7.9 × 108 A sr-1 cm2. © IOP Publishing and Deutsche Physikalische Gesellschaft.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); National Institute for Nanotechnology (NINT-INNT)
Peer reviewedYes
NPARC number21269991
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Record identifiera351e2f9-8e8e-49d5-bc52-a71e353dead0
Record created2013-12-13
Record modified2016-05-09
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