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Open AccessArticle

Theoretical Study of a 0.22 THz Backward Wave Oscillator Based on a Dual-Gridded, 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 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.
Appl. Sci. 2018, 8(12), 2462; https://doi.org/10.3390/app8122462
Received: 25 October 2018 / Revised: 28 November 2018 / Accepted: 29 November 2018 / Published: 2 December 2018
(This article belongs to the Section Nanotechnology and Applied Nanosciences)
The carbon nanotube (CNT) cold cathode is an attractive choice for millimeter and terahertz vacuum electronic devices owning to its unique instant switch-on and high emission current density. A novel, dual-gridded, field emission architecture based on a CNT cold cathode is proposed here. CNTs are synthesized directly on the cathode surface. The first separating grid is attached to the CNT cathode surface to shape the CNT cathode array. The second separating grid is responsible for controlled extraction of electrons from the CNT emitters. The cathode surface electric field distribution has been improved drastically compared to conventional planar devices. Furthermore, a high-compression-ratio, dual-gridded, CNT-based electron gun has been designed to further increase the current density, and a 21 kV/50 mA electron beam has been obtained with beam transparency of nearly 100%, along with a compression ratio of 39. A 0.22 THz disk-loaded waveguide backward wave oscillator (BWO) based on this electron gun architecture has been realized theoretically with output power of 32 W. The results indicate that higher output power and higher frequency terahertz BWOs can be made using advanced, nanomaterial-based cold cathodes. View Full-Text
Keywords: carbon-nanotube; cold cathode; field emission; terahertz; vacuum electronic device; backward wave oscillator carbon-nanotube; cold cathode; field emission; terahertz; vacuum electronic device; backward wave oscillator
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MDPI and ACS Style

Chen, Q.; Yuan, X.; Cole, M.T.; Zhang, Y.; Meng, L.; Yan, Y. Theoretical Study of a 0.22 THz Backward Wave Oscillator Based on a Dual-Gridded, Carbon-Nanotube Cold Cathode. Appl. Sci. 2018, 8, 2462.

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