Fiber tip-based electron source

Casandruc, Albert; Kassier, Günther; Zia, Haider; Bücker, Robert; Miller, R. J. Dwayne

doi:10.1116/1.4902016

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Fiber tip-based electron source

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Casandruc, Albert
Miller Group, Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
CFEL, Luruper Chaussee 149, 22761 Hamburg, Germany;

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Kassier, Günther
Miller Group, Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
CFEL, Luruper Chaussee 149, 22761 Hamburg, Germany;

/persons/resource/persons136126

Zia, Haider
Miller Group, Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
CFEL, Luruper Chaussee 149, 22761 Hamburg, Germany;

/persons/resource/persons136038

Bücker, Robert
Miller Group, Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
CFEL, Luruper Chaussee 149, 22761 Hamburg, Germany;

/persons/resource/persons136024

Miller, R. J. Dwayne
Miller Group, Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Departments of Chemistry and Physics, University of Toronto, Toronto, Ontario M5S 3H6, Canada;
CFEL, Luruper Chaussee 149, 22761 Hamburg, Germany;

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Citation

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.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0026-CA48-D

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.