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周期加载波导中匀速带电粒子的衍射辐射是产生较高频段可调谐太赫兹电磁辐射(频率高于1 THz)的有效方法. 对圆柱形周期加载波导中偏心电子注产生的衍射辐射现象, 进行了严格的理论分析和粒子模拟验证. 研究表明, 偏心电子注在波导中除了激励起角向对称模(TM0波)以外, 还将激励起角向模式为1 (HE1波)和2 (HE2波)的角向非对称模. 并且电子注偏离轴线距离越大, 激励的角向非对称模场强越强. 每个模式的功率随电子注的激励位置呈变态贝塞尔函数平方关系变化, 与电子注电流平方成正比. 理论分析与计算机模拟的结果符合较好. 研究结果将为发展该类可调谐太赫兹辐射源提供理论依据.The special kind of diffraction radiation from the uniformly moving electron beam in a periodical waveguide structure has great potential applications in developing the tunable terahertz radiation sources. Rigorous theoretical analyses and detailed computer simulation on the diffraction radiation from the periodical waveguide structure excited by the eccentric electron beam are carried out. Our results show that the eccentric beam can primarily excite the axial symmetrical modes (TM0 modes) and axial unsymmetrical modes with axial variation numbers of 1 and 2. The energies of the unsymmetrical modes increase with the distance of electron beam to the axis. For each mode, the radiation intensity changes with beam location as the square of modified Bessel function and in direct proportion with the square of the charge quantity. The results of theoretical analyses and computer simulations are in good agreement with each other. These results are of significance for developing this kind of radiation source.
[1] Liu S G 2006 China Basic Science 1 7 (in Chinese) [刘盛纲 2006 中国基础科学 1 7 ]
[2] Siegel P H 2002 IEEE Trans. MTT 50 91
[3] Liu D W, Yuan X S, Yan Y, Liu S G 2009 Chin. Phys. B 18 3049
[4] Ferguson B, Zhang X C 2003 Physics 32 286 (in Chinese) [Bradley Ferguson, 张希成 2003 物理 32 286]
[5] Zhang R, Cao J C 2010 Acta Phys. Sin. 59 3294 (in Chiense) [张戎, 曹俊诚 2010 59 3294]
[6] Charles A Schmuttenmaer 2008 International Journal of Terahertz Science and Technology 1 1
[7] Michael von Ortenberg 2008 International Journal of Terahertz Science and Technology 1 9
[8] Li Z Y, Yao J Q, Xu D G, Zhong K, Wang J L, Bing P B 2011 Chin. Phys. B 20 054207
[9] MacPherson E P2011 International Journal of Terahertz Science and Technology 3 163
[10] Qi Q, Williams B S, Kumar S, Reno J L, Hu Q 2009 Nat. Photon. 3 732
[11] Wang Y Y, Zhang C H, Ma J L, Jin B B, Xu W W, Kang L, Chen J, Wu P H 2010 Acta Phys. Sin. 58 6884 (in Chinese) [王媛媛, 张彩虹, 马金龙, 金彪兵, 许伟伟, 康琳, 陈建, 吴培亨 2010 58 6884]
[12] Thumm M 2010 International Journal of Terahertz Science and Technology 1 31
[13] Zhang K C, Wu Z H, Liu S G 2009 Journal of Infrared, Millimeter, and Terahertz Waves 30 309
[14] Zhang K C, Wu Z H, Liu S G 2008 Chin. Phys. B 17 3402
[15] Swegle J A, Poukey J W, Leifeste G T 1985 Phys. Fluids 28 2882
[16] Nguyen K T, Pasour J A, Antonsen T M 2009 IEEE Trans. Electronic Devices 56 744
[17] Mineo M, Paoloni C 2011 IVEC-2011 265
[18] Adamo G, MacDonald K F, Fu Y H , Wang C M, Tsai D P, Garcia de Abajo F J, Zheludev N I 2009 Phys. Rev. Lett. 103 113901
[19] Liu S G, Hu M, Zhang Y X, Liu W H, Zhang P, Zhou J 2011 Phys. Rev. E 83 066609
[20] Liu W M, Gai W 2009 Phys. Rev. st: Accelerate. Beam 12 051301
[21] Wang D, Fan Z K, Chen D B, Deng J K 2007 IEEE Trans. Plasma Sci. 35 1070
[22] Wang H Y, Yang Z Q, Zhao L X, Liang Z 2005 IEEE Trans. Plasma Sci. 33 111
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[1] Liu S G 2006 China Basic Science 1 7 (in Chinese) [刘盛纲 2006 中国基础科学 1 7 ]
[2] Siegel P H 2002 IEEE Trans. MTT 50 91
[3] Liu D W, Yuan X S, Yan Y, Liu S G 2009 Chin. Phys. B 18 3049
[4] Ferguson B, Zhang X C 2003 Physics 32 286 (in Chinese) [Bradley Ferguson, 张希成 2003 物理 32 286]
[5] Zhang R, Cao J C 2010 Acta Phys. Sin. 59 3294 (in Chiense) [张戎, 曹俊诚 2010 59 3294]
[6] Charles A Schmuttenmaer 2008 International Journal of Terahertz Science and Technology 1 1
[7] Michael von Ortenberg 2008 International Journal of Terahertz Science and Technology 1 9
[8] Li Z Y, Yao J Q, Xu D G, Zhong K, Wang J L, Bing P B 2011 Chin. Phys. B 20 054207
[9] MacPherson E P2011 International Journal of Terahertz Science and Technology 3 163
[10] Qi Q, Williams B S, Kumar S, Reno J L, Hu Q 2009 Nat. Photon. 3 732
[11] Wang Y Y, Zhang C H, Ma J L, Jin B B, Xu W W, Kang L, Chen J, Wu P H 2010 Acta Phys. Sin. 58 6884 (in Chinese) [王媛媛, 张彩虹, 马金龙, 金彪兵, 许伟伟, 康琳, 陈建, 吴培亨 2010 58 6884]
[12] Thumm M 2010 International Journal of Terahertz Science and Technology 1 31
[13] Zhang K C, Wu Z H, Liu S G 2009 Journal of Infrared, Millimeter, and Terahertz Waves 30 309
[14] Zhang K C, Wu Z H, Liu S G 2008 Chin. Phys. B 17 3402
[15] Swegle J A, Poukey J W, Leifeste G T 1985 Phys. Fluids 28 2882
[16] Nguyen K T, Pasour J A, Antonsen T M 2009 IEEE Trans. Electronic Devices 56 744
[17] Mineo M, Paoloni C 2011 IVEC-2011 265
[18] Adamo G, MacDonald K F, Fu Y H , Wang C M, Tsai D P, Garcia de Abajo F J, Zheludev N I 2009 Phys. Rev. Lett. 103 113901
[19] Liu S G, Hu M, Zhang Y X, Liu W H, Zhang P, Zhou J 2011 Phys. Rev. E 83 066609
[20] Liu W M, Gai W 2009 Phys. Rev. st: Accelerate. Beam 12 051301
[21] Wang D, Fan Z K, Chen D B, Deng J K 2007 IEEE Trans. Plasma Sci. 35 1070
[22] Wang H Y, Yang Z Q, Zhao L X, Liang Z 2005 IEEE Trans. Plasma Sci. 33 111
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