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Modeling and simulation of a powerful terahertz generator based on Cherenkov superradiance
Author(s) -
Zhang Hai,
Wang Jianguo,
Tian Chunming
Publication year - 2010
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.25019
Subject(s) - terahertz radiation , cherenkov radiation , superradiance , microwave , physics , photomixing , optics , cathode ray , generator (circuit theory) , terahertz gap , pulse generator , electron , optoelectronics , power (physics) , laser , far infrared laser , terahertz metamaterials , nuclear physics , voltage , quantum mechanics , detector
In this article, the preliminary studies of coherent stimulated terahertz radiation from intense, subnanosecond electron beam are presented. The mechanism of terahertz pulse generation is associated with self‐bunching of the beam and slippage of the wave over the whole electron flow. This so‐called Cherenkov superradiance (SR) was used to propose a compact terahertz generator with high peak power. A large cross section (overmoded), slow wave structure was designed to support the high power handling capability, and the mode competition was avoided by operating the device in the surface wave status. With 2.5D particle‐in‐cell simulation, we investigated the “hot” characteristics of the proposed superradiant terahertz generator and found that the SR peak power could be further increased by optimizing the amplitude profile of electron pulse. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 657–662, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25019