Tailoring the emissive properties of photocathodes through materials engineering: Ultra-thin multilayers

Tailoring the emissive properties of photocathodes through materials engineering: Ultra-thin... Article history: We report on an experimental verification that emission properties of photocathodes can be manipulated Received 31 August 2015 through the engineering of the surface electronic structure. Ultrathin multilayered MgO/Ag(0 0 1)/MgO Received in revised form 22 October 2015 films were grown by pulsed laser deposition, tuning the thickness n of the flanking MgO layers to 0, 2, 3, Accepted 6 November 2015 and 4 monolayers. We observed an increase in quantum efficiency and simultaneous decrease in work Available online 12 November 2015 function with layer thickness. The scale and trend direction of measurements are in good but not excellent agreement with theory. Angle resolved photoemission data for the multilayered sample n = 3 showed that Keywords: the emission profile has a metallic-like momentum dispersion. Deviations from theoretical predictions Pulsed laser deposition [K. Németh et al., PRL 104, 046801 (2010)] are attributed to imperfections of real surfaces in contrast with RHEED the ideal surfaces of the calculation. Photoemissive properties of cathodes are critical for electron beam Epitaxy applications such as photoinjectors for Free Electron Lasers (FEL) and Energy Recovery Linacs (ERL). An Photocathode Work function ideal photoemitter has a high quantum efficiency, low work function, low intrinsic emittance http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Applied Surface Science Elsevier

Tailoring the emissive properties of photocathodes through materials engineering: Ultra-thin multilayers

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Publisher
Elsevier
Copyright
Copyright © 2015 Elsevier B.V.
ISSN
0169-4332
eISSN
1873-5584
D.O.I.
10.1016/j.apsusc.2015.11.064
Publisher site
See Article on Publisher Site

Abstract

Article history: We report on an experimental verification that emission properties of photocathodes can be manipulated Received 31 August 2015 through the engineering of the surface electronic structure. Ultrathin multilayered MgO/Ag(0 0 1)/MgO Received in revised form 22 October 2015 films were grown by pulsed laser deposition, tuning the thickness n of the flanking MgO layers to 0, 2, 3, Accepted 6 November 2015 and 4 monolayers. We observed an increase in quantum efficiency and simultaneous decrease in work Available online 12 November 2015 function with layer thickness. The scale and trend direction of measurements are in good but not excellent agreement with theory. Angle resolved photoemission data for the multilayered sample n = 3 showed that Keywords: the emission profile has a metallic-like momentum dispersion. Deviations from theoretical predictions Pulsed laser deposition [K. Németh et al., PRL 104, 046801 (2010)] are attributed to imperfections of real surfaces in contrast with RHEED the ideal surfaces of the calculation. Photoemissive properties of cathodes are critical for electron beam Epitaxy applications such as photoinjectors for Free Electron Lasers (FEL) and Energy Recovery Linacs (ERL). An Photocathode Work function ideal photoemitter has a high quantum efficiency, low work function, low intrinsic emittance

Journal

Applied Surface ScienceElsevier

Published: Jan 1, 2016

References

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