Enhancement of Coherent THz Smith-Purcell Radiation by Resonance Overlapping

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• 作者：Weiwei Li ; Yuanfang Xu ; Yalin Lu ; Zhigang He…
• 关键词：Terahertz radiation ; Smith ; Purcell radiation ; Electron bunch train ; Narrow band
• 刊名：Journal of Infrared, Millimeter, and Terahertz Waves
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：38
• 期：1
• 页码：12-21
• 全文大小：
• 刊物类别：Physics and Astronomy
• 刊物主题：Electrical Engineering; Electronics and Microelectronics, Instrumentation; Classical Electrodynamics;
• 出版者：Springer US
• ISSN：1866-6906
• 卷排序：38

文摘

Frequency-locked coherent Smith-Purcell Radiation (SPR) is emitted when a train of pre-bunched electron beam passes close to the surface of a metallic grating, which develops an energy density spectrum restricted to harmonics of the bunching frequency. For the lamellar grating with narrow grooves, the radiation spectrum from a single electron can also have a feature of narrow band, which is related to the grating structure and the beam energy. The combination of them is proposed in this paper. By properly choosing the parameters, the peak frequency of single electron radiation can be overlapped with the harmonics of the bunching frequency of the electron bunch train, leading to the generation of extremely intense narrow-band THz radiation.