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

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9 Author(s)
Wenxin Liu ; Inst. of High Energy Electron., Univ. of Electron. Sci. & Technol. of China, Chengdu ; Ziqiang Yang ; Zheng Liang ; Dazhi Li
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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.

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Plasma Science, IEEE Transactions on  (Volume:36 ,  Issue: 3 )