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

Journal Article · Mon Sep 17 00:00:00 EDT 2012 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4752730· OSTI ID:22080452

Yaxin, Zhang; Yucong, Zhou; Liang, Dong; Shenggang, Liu ^[1]

---

1. Terahertz Science and Technology Research Center, University of Electronic Science and Technology of China, Chengdu 610054 (China)

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/cm{sup 2} 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.

• OSTI ID: 22080452
• Journal Information: Applied Physics Letters, Vol. 101, Issue 12; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ASYMMETRY
CURRENT DENSITY
DIFFRACTION
DIFFRACTION GRATINGS
EFFICIENCY
ELECTRON BEAMS
PERIODICITY
WAVEGUIDES