Design and Simulation of a Multi-Sheet Beam Terahertz Radiation Source Based on Carbon-Nanotube Cold Cathode

Yifan Yan, Xuesong Yuan, Xiaotao Xu, Matthew Cole, Yu Zhang, Hailong Li, Yong Yin, Bin Wang, Yang Yan

Research output: Contribution to journalArticlepeer-review

8 Citations (SciVal)


Carbon nanotube (CNT) cold cathodes are proving to be compelling candidates for miniaturized terahertz (THz) vacuum electronic devices (VEDs) owning to their superior field-emission (FE) characteristics. Here, we report on the development of a multi-sheet beam CNT cold cathode electron optical system with concurrently high beam current and high current density. The microscopic FE characteristics of the CNT film emitter is captured through the development of an empirically derived macroscopic simulation model which is used to provide representative emission performance. Through parametrically optimized macroscale simulations, a five-sheet-beam triode electron gun has been designed, and has been shown to emit up to 95 mA at 3.2 kV. Through careful engineering of the electron gun geometric parameters, a low-voltage compact THz radiation source operating in high-order TM 5,1 mode is investigated to improve output power and suppress mode competition. Particle in cell (PIC) simulations show the average output power is 33 W at 0.1 THz, and the beam–wave interaction efficiency is approximately 10%.

Original languageEnglish
Article number1768
Issue number12
Early online date12 Dec 2019
Publication statusPublished - 12 Dec 2019


  • Carbon nanotubes
  • Cold cathode
  • Field emission
  • High-order mode
  • Multi-sheet beam
  • Nanotechnology
  • Terahertz
  • Vacuum electronic devices

ASJC Scopus subject areas

  • General Chemical Engineering
  • General Materials Science


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