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  Fiber tip-based electron source

Casandruc, A., Kassier, G., Zia, H., Bücker, R., & Miller, R. J. D. (2015). Fiber tip-based electron source. Journal of Vacuum Science and Technology B, 33(3): 03C101. doi:10.1116/1.4902016.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0026-CA48-D Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-3E9B-5
Genre: Journal Article

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http://dx.doi.org/10.1116/1.4902016 (Publisher version)
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 Creators:
Casandruc, Albert1, 2, 3, Author              
Kassier, Günther1, 2, Author              
Zia, Haider1, 2, 3, Author              
Bücker, Robert1, 2, Author              
Miller, R. J. Dwayne1, 2, 4, Author              
Affiliations:
1Miller Group, Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938288              
2CFEL, Luruper Chaussee 149, 22761 Hamburg, Germany, ou_persistent22              
3International Max Planck Research School for Ultrafast Imaging & Structural Dynamics (IMPRS-UFAST), Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266714              
4Departments of Chemistry and Physics, University of Toronto, Toronto, Ontario M5S 3H6, Canada, ou_persistent22              

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Free keywords: Field emission; Electric measurements; Electron emission; Gold; Metallic coatings
 Abstract: The authors report on the first experimental characterization of a fiber tip-based electron source, where electron emission can be triggered by both electric field and optical excitation. Our approach consists of coating the open aperture of a commercial 100 nm apex size near-field scanning optical microscopy fiber tip with a 10 nm thick tungsten (W) layer, which is back-illuminated by a 405 nm continuous-wave laser beam in the presence of an extraction electric field. Despite the very low optical transmission of the fiber due to the subwavelength aperture size, measurements show a clearly enhanced emission when photoexciting the W layer with respect to pure field emission. The emission response time is slower than the optical trigger time, suggesting that thermal effects are predominant in the studied regime. To back up this hypothesis, the authors fabricated a nanometric thermocouple probe based on a Pt/Au junction and measured the temporal response of the tip temperature. The measured switch-on time for the tip temperature is consistent with the switch-on time of the optically enhanced electron emission.

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Language(s): eng - English
 Dates: 2014-08-292014-10-302014-11-262015-05
 Publication Status: Published in print
 Pages: 5
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1116/1.4902016
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Title: Journal of Vacuum Science and Technology B
  Other : JVST B
  Other : J. Vac. Sci. Techn. B
Source Genre: Journal
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Publ. Info: New York : Published by AVS through the American Institute of Physics
Pages: - Volume / Issue: 33 (3) Sequence Number: 03C101 Start / End Page: - Identifier: ISSN: 0734-2101
CoNE: /journals/resource/954928495416