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Open AccessArticle

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

1
School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China
2
Department of Electronic and Electrical Engineering, University of Bath, North Road, Bath BA2 7AY, UK
3
State Key Laboratory Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou 510275, China
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(12), 1768; https://doi.org/10.3390/nano9121768
Received: 13 November 2019 / Revised: 6 December 2019 / Accepted: 10 December 2019 / Published: 12 December 2019
(This article belongs to the Special Issue Electronics, Electromagnetism and Applications of Nanomaterials)
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%. View Full-Text
Keywords: nanotechnology; carbon nanotubes; cold cathode; field emission; terahertz; vacuum electronic devices; multi-sheet beam; high-order mode nanotechnology; carbon nanotubes; cold cathode; field emission; terahertz; vacuum electronic devices; multi-sheet beam; high-order mode
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MDPI and ACS Style

Zu, Y.; Yuan, X.; Xu, X.; Cole, M.T.; Zhang, Y.; Li, H.; Yin, Y.; Wang, B.; Yan, Y. Design and Simulation of a Multi-Sheet Beam Terahertz Radiation Source Based on Carbon-Nanotube Cold Cathode. Nanomaterials 2019, 9, 1768.

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