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Coherent terahertz radiation from high-harmonic component of modulated free-electron beam in a tapered two-asymmetric grating structure

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4 Author(s)
Zhang, Ya-Xin ; Terahertz Science and Technology Research Center, University of Electronic Science and Technology of China, Chengdu 610054, China ; Zhou, Yu-Cong ; Dong, Liang ; Sheng-Gang Liu

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Based on the mechanism of incoherent diffraction radiation excited by an electron bunch in a waveguide with periodic structure, this paper presents the concept of coherent terahertz (THz) radiation from the high-harmonic component of a modulated free-electron beam in a tapered two-asymmetric grating structure. The results show that in this mechanism 0.43 THz radiation can be generated with 10 A/cm2 current density, and the efficiency can reach 0.5%. Because of the low required current density and relative high efficiency, this concept shows the application potential for electron-beam-driven terahertz sources.

Published in:

Applied Physics Letters  (Volume:101 ,  Issue: 12 )

Date of Publication:

Sep 2012

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