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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Toward a terahertz-driven electron gun.

W Ronny Huang1, Emilio A Nanni1, Koustuban Ravi1

  • 1Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

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Summary
This summary is machine-generated.

A novel single-cycle terahertz (THz) electron gun achieves high-energy electron bunches with minimal spread. This breakthrough enables advanced condensed matter research using ultrafast electron sources.

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Area of Science:

  • Condensed Matter Physics
  • Accelerator Physics
  • Ultrafast Science

Background:

  • Condensed matter physicists require femtosecond electron bunches with keV energies and eV energy spread.
  • Current ultrafast electron guns are limited by achievable electric fields (10 MV/m for DC, 200 MV/m for RF).
  • These electron sources are crucial for ultrafast electron diffraction, electron energy-loss spectroscopy, and seeding X-ray Free Electron Lasers (FELs).

Purpose of the Study:

  • To demonstrate a single-cycle terahertz (THz) electron gun capable of generating high-quality electron bunches.
  • To explore the potential of GV/m surface electric fields for electron acceleration.
  • To overcome the limitations of existing ultrafast electron gun technologies.

Main Methods:

  • Utilized a single-cycle THz pulse to accelerate electron bunches from a flat copper photocathode.
  • Achieved peak electric fields of 72 MV/m with microjoule THz pulse energies at a 1 kHz repetition rate.
  • Accelerated 50 fC electron bunches from rest to tens of eV.

Main Results:

  • Demonstrated acceleration of electron bunches to tens of eV using a 72 MV/m THz field.
  • Showcased the potential for generating monoenergetic electron beams of approximately 100 keV by scaling to GV/m THz fields.
  • Highlighted the efficiency of single-cycle THz waveforms for generating intense electric fields.

Conclusions:

  • Single-cycle THz electron guns offer a unique pathway to achieve GV/m surface electric fields.
  • This technology promises to deliver highly energetic and monoenergetic electron beams for advanced scientific applications.
  • The developed method overcomes previous limitations in electric field strength, paving the way for next-generation ultrafast electron sources.