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Towards High Brightness from Plasmon-Enhanced Photoemitters

Oct 20, 2022
4 pages
Published in:
  • JACoW NAPAC2022 (2022) TUYD4
Contribution to:
  • Published: Oct 20, 2022
DOI:
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Abstract: (JACOW)
Plasmonic cathodes, whose nanoscale features may locally enhance optical energy from the driving laser trapped at the vacuum interface, have emerged as a promising technology for improving the brightness of metal cathodes. A six orders of magnitude improvement [1] in the non-linear yield of metals has been experimentally demonstrated through this type of nanopatterning. Further, nanoscale lens structures may focus light below its free-space wavelength offering multiphoton photoemission from a region near 10 times smaller [2] than that achievable in typical photoinjectors. In this proceeding, we report on our efforts to characterize the brightness of two plasmonic cathode concepts: a spiral lens and a nanogroove array. We demonstrate an ability to engineer and fabricate nanoscale patterned cathodes by comparing their optical properties with those computed with a finite difference time domain (FDTD) code. The emittance and nonlinear yield of the cathodes are measured under ultrafast laser irradiation. Finally, prospects of this technology for the control and acceleration of charged particle beams are discussed.
  • cathode
  • electron
  • laser
  • interface
  • emittance
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    Plasmon-Enhanced Photocathode for High Brightness and High Repetition Rate X-Ray Sources

    • A. Polyakov
  • [2]

    Plasmonic lenses for tunable ultrafast electron emitters at the nanoscale

    • D.B. Durham
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      ,
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    et al.
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    Why Metallic Surfaces with Grooves a Few Nanometers Deep and Wide May Strongly Absorb Visible Light

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    Electromagnetic enhancement by a single nano-groove in metallic substrate

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    Thermal emittance and response time measurements of negative electron affinity photocathodes

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    Ultrafast Electron Emission from a Sharp Metal Nanotaper Driven by Adiabatic Nanofocusing of Surface Plasmons

    • J. Vogelsang