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Surface-Plasmon Resonance-Enhanced Multiphoton Emission of High-Brightness Electron Beams from a Nanostructured Copper Cathode

R. K. Li, H. To, G. Andonian, J. Feng, A. Polyakov, C. M. Scoby, K. Thompson, W. Wan, H. A. Padmore, and P. Musumeci
Phys. Rev. Lett. 110, 074801 – Published 11 February 2013
Physics logo See Viewpoint: Attention to Nanoscale Detail Leads to Brighter e-Beams

Abstract

We experimentally investigate surface-plasmon assisted photoemission to enhance the efficiency of metallic photocathodes for high-brightness electron sources. A nanohole array-based copper surface was designed to exhibit a plasmonic response at 800 nm, fabricated using the focused ion beam milling technique, optically characterized and tested as a photocathode in a high power radio frequency photoinjector. Because of the larger absorption and localization of the optical field intensity, the charge yield observed under ultrashort laser pulse illumination is increased by more than 100 times compared to a flat surface. We also present the first beam characterization results (intrinsic emittance and bunch length) from a nanostructured photocathode.

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  • Received 12 November 2012

DOI:https://doi.org/10.1103/PhysRevLett.110.074801

© 2013 American Physical Society

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Attention to Nanoscale Detail Leads to Brighter e-Beams

Published 11 February 2013

Plasmons on a patterned surface can enhance the production of bright electron beams.

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Authors & Affiliations

R. K. Li1, H. To1, G. Andonian1, J. Feng2, A. Polyakov2, C. M. Scoby1, K. Thompson2, W. Wan2, H. A. Padmore2, and P. Musumeci1,*

  • 1Department of Physics and Astronomy, UCLA, Los Angeles, California 90095, USA
  • 2Advanced Light Source Division, LBNL, Berkeley, California 94720, USA

  • *musumeci@physics.ucla.edu

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Issue

Vol. 110, Iss. 7 — 15 February 2013

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