Terahertz amplification by electron beam excited graphene surface plasmon polaritons in a cylindrical structure

Zhao Tao ^{1, 2*} , Gong Sen ^{1, 2}, Hu Min ^{1, 2}, Zhong Renbin ^{1, 2}, Zhang Ping ^{1, 2}, Yu Chengpeng ^{1, 2}, and Liu Shenggang ^{1, 2
1} Terahertz Science and Technology Research Center, University of Electronic Science and Technology of China, Chengdu, Sichuan, China, 610054
² Cooperative Innovation Centre of Terahertz Science, National 2011 project
^* Email: forzhaotao@126.com

View Full Text: PDF

Abstract: Graphene surface plasmon polaritons (SPPs) exhibit strong mode confinement and long propagation distances, and the characteristics are tunable via changing the chemical potential, etc. In this paper, we propose a novel physical mechanism that the graphene SPPs excited by electron beam can be used to amplify terahertz (THz) waves. Theoretical results show that the energy transfers from electron beam to the SPPs occurs when the velocity of electron beam is moderately faster than the phase velocity of SPPs. This is just the similar results by the space charge wave theory. The physical mechanism may provide great potential for graphene SPPs-based amplifiers.

Keywords: Electron beam, Surface plasmon polaritons, Amplifier, Terahertz, Cylindrical structure

Received: 2016-9-10

Published: 2016-9-30

Cite this article:
Zhao Tao, Gong Sen, Hu Min, Zhong Renbin, Zhang Ping, Yu Chengpeng, and Liu Shenggang. Terahertz amplification by electron beam excited graphene surface plasmon polaritons in a cylindrical structure[J]. International Journal of Terahertz Science and Technology, 2016, Vol.9, No.3: 101-108.  DOI:10.11906/TST.101-108.2016.09.10

URL: http://www.tstnetwork.org/10.11906/TST.101-108.2016.09.10