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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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