Enhancements of Terahertz Radiation From a Grating Waveguide by Two-Stream Instability

Author

Liu, Wenxin ; Yang, Ziqiang ; Liang, Zheng ; Li, Dazhi ; Imasaki, Kazuo ; Shi, Zongjun ; Lan, Feng ; Park, Gun-Sik ; Liu, Shenggang

Author_Institution

Inst. of High Energy Electron., Univ. of Electron. Sci. & Technol. of China, Chengdu

Volume

36

Issue

3

fYear

2008

fDate

6/1/2008 12:00:00 AM

Firstpage

748

Lastpage

756

Abstract

An approach to the enhancement of terahertz radiation from a grating waveguide by two-stream instability (TSI) is presented in this paper. The grating waveguide composed of a planar metallic grating and an opposite plate is driven by two electron beams with a velocity separation. The dispersion equation is derived with the linearized fluid theory and solved numerically. Also, the numerical results show that a considerable enhancement of growth rate is possible at an optimized velocity separation. With the help of 2-D particle-in-cell simulations, the improvement of radiation performance induced by the TSI is demonstrated.

Keywords

diffraction gratings; electron beams; planar waveguides; plasma instability; submillimetre wave generation; dispersion equation; electron beams; grating waveguide; linearized fluid theory; particle-in-cell simulations; planar metallic grating; terahertz radiation; terahertz sources; two-stream instability; Electron beams; Elementary particle vacuum; Free electron lasers; Gratings; Laser theory; Medical simulation; Quantum cascade lasers; Space technology; Synchrotrons; Tunable circuits and devices; Grating waveguide; particle-in-cell (PIC) simulation; terahertz (THz) radiation; two-stream instability (TSI);

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/TPS.2008.922502

Filename

4539872