Title :
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
fDate :
6/1/2008 12:00:00 AM
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);
Journal_Title :
Plasma Science, IEEE Transactions on
DOI :
10.1109/TPS.2008.922502
