Tao Zhao *, Min Hu, Renbin Zhong, Sen Gong and Shenggang Liu
Terahertz Research Center, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, Sichuan, 610054, China
* Email: forzhaotao@uestc.edu.cn
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Abstract: A physical mechanism of multicolor coherent terahertz radiation is presented. We have found that, in a transmission metallic grating with deep enough slits, the multi-modes Fabry–Pérot resonances in the slit cavity can be efficiently excited by an electron beam moving atop the grating, and then transformed into radiation via a special Smith-Purcell effect. The radiation is coherent and highly directional, which is essentially different from the ordinary Smith-Purcell radiation. The radiation power density is an order of magnitude higher. The radiation frequency can be tuned by adjusting the grating parameters and beam energy. Based on this mechanism, the coherent, tunable, intense, and miniature terahertz radiation sources can be developed.
Keywords: Terahertz radiation, Fabry–Pérot resonances, Smith-Purcell effect
Received: 2018-9-20
Published: 2019-3-31
Cite this article:
Tao Zhao, Min Hu, Renbin Zhong, Sen Gong and Shenggang Liu; Coherent terahertz radiation from Fabry–Pérot resonances via a special Smith-Purcell effect [J]. International Journal of Terahertz Science and Technology, 2019, Vol.12, No.1: 26-32. DOI:10.11906/TST.026-032.2019.03.03
URL: http://www.tstnetwork.org/10.11906/TST.026-032.2019.03.03
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