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Terahertz Smith-Purcell Radiation from Surface Plasmon Wave in One-Dimensional Photonic Crystal Structure using Counter-Streaming Electron Beam

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6 Author(s)
Shin, Y.M. ; Sch. of Phys., Seoul Nat. Univ. ; So, J.K. ; Jang, K.H. ; Won, J.H.
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A new THz Smith-Purcell radiation (SPR) free electron laser (FEL) using counter-streaming electron beams (CSEBs) on a one-dimensionally structured metal slab is introduced. The analytical dispersion curve and the calculated SPR-intensity of the CSEBs-SPR system explain how plasmon-transmissions between the CSEBs lower the tansition-threshold from a spontaneous emission to a stimulated one as well as enhance the radiation intensity. The self-frequency-locking effect of the system is verified by numerical simulations based on particle-in-cell (PIC) computation. On summary of the numerical analyses, the transition-threshold of CSEBs-SPR is lowered down to 2-3% of a conventional SPR. The radiation intensity of the former is about two orders of magnitude larger than that of the latter at the same beam-current density

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Vacuum Electronics Conference, 2006 held Jointly with 2006 IEEE International Vacuum Electron Sources., IEEE International

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