Ultrafast laser nanopatterning of copper plasmonic photocathodes for enhanced photoemission in electron accelerators

M. Martinez-Calderon; B. Groussin; V. Bjelland; E. Chevallay; V. Fedosseev; M. Himmerlich; P. Lorenz; A. Manjavacas; B. Marsh; R. E. Rossel; W. Wuensch; E. Granados

doi:10.1117/12.3022130

6 June 2024 Ultrafast laser nanopatterning of copper plasmonic photocathodes for enhanced photoemission in electron accelerators

M. Martinez-Calderon, B. Groussin, V. Bjelland, E. Chevallay, V. Fedosseev, M. Himmerlich, P. Lorenz, A. Manjavacas, B. Marsh, R. E. Rossel, W. Wuensch, E. Granados

Author Affiliations +

Proceedings Volume PC12991, Nanophotonics X; PC129911W (2024) https://doi.org/10.1117/12.3022130
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Conference Poster

Abstract

Photocathodes are key elements in high-brightness electron sources and ubiquitous in the operation of large-scale accelerators. In this work, we propose the use of ultrafast laser nanostructuring techniques on copper photocathodes as a way to enhance the quantum efficiency of metallic photocathodes and enable their use in next-generation electron photoinjectors. When the surface is nanoengineered with patterns and particles much smaller than the optical wavelength, it can lead to the excitation of localized surface plasmons that produce hot electrons, ultimately contributing to the overall charge produced. To quantify the performance of laser nanopatterned photocathodes, we measured their quantum efficiency in a typical electron gun setup. Our experimental results suggest that plasmon-induced hot electrons lead to a significant increase in quantum efficiency, showing an overall charge enhancement factor of at least 4.5 and up to 25. We demonstrate laser nanopatterned plasmonic photocathodes outperform standard metallic photocathodes, and can be directly produced in-situ at the electron gun level in vacuum environments and without any disruptive intervention.

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M. Martinez-Calderon, B. Groussin, V. Bjelland, E. Chevallay, V. Fedosseev, M. Himmerlich, P. Lorenz, A. Manjavacas, B. Marsh, R. E. Rossel, W. Wuensch, and E. Granados "Ultrafast laser nanopatterning of copper plasmonic photocathodes for enhanced photoemission in electron accelerators", Proc. SPIE PC12991, Nanophotonics X, PC129911W (6 June 2024); https://doi.org/10.1117/12.3022130

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