Electromagnetic amplification by means of noble metal surface plasmon polaritons excited by electron beam

Gong Sen ^{1*, 2}, Zhao Tao ^{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
^*1 Email: gongsen@uestc.edu.cn

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Abstract: In this paper, the electromagnetic wave amplification in the frequency regime from visible light to ultra-violet based on noble metal surface plasmon polaritons (SPPs) excited by electron beam is presented. The theoretical analyses and numerical calculations show that SPPs can be amplified by the interaction between the electron beam and the waves, provided the beam velocity is a little bit larger than the phase velocity of SPPs wave. The gain of the amplification reaches up to about 10 dB/cm for the current density 200 A/cm² or even lower. When the beam velocity is larger than the Cherenkov radiation threshold, the SPPs can be transformed into radiation. The results of numerical calculations also show that promising amplification gain can also be obtained in the structure with parameters larger than nanometers, and this is of great significance for practical manufacture and applications.

Keywords: Amplification, Surface plasmon polaritons, Electron beam

Received: 2016-9-10

Published: 2016-9-30

Cite this article:
Gong Sen, Zhao Tao, Hu Min, Zhong Renbin, Zhang Ping, Yu Chengpeng, and Liu Shenggang. Electromagnetic amplification by means of noble metal surface plasmon polaritons excited by electron beam[J]. International Journal of Terahertz Science and Technology, 2016, Vol.9, No.3: 82-92.  DOI:10.11906/TST.082-092.2016.09.08

URL: http://www.tstnetwork.org/10.11906/TST.082-092.2016.09.08