Title :
Terahertz Smith-Purcell Radiation from Surface Plasmon Wave in One-Dimensional Photonic Crystal Structure using Counter-Streaming Electron Beam
Author :
Shin, Y.M. ; So, J.K. ; Jang, K.H. ; Won, J.H. ; Srivastava, A. ; Park, G.S.
Author_Institution :
Sch. of Phys., Seoul Nat. Univ.
Abstract :
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
Keywords :
crystal structure; dispersion (wave); electron beams; free electron lasers; photonic crystals; submillimetre waves; surface plasmons; 1D photonic crystal structure; CSEB-SPR system; PIC computation; beam-current density; counter-streaming electron beam; dispersion curve; free electron laser; metal slab; particle-in-cell computation; plasmon transmissions; self-frequency-locking effect; surface plasmon wave; terahertz Smith-Purcell radiation; Current density; Electron beams; Frequency; Gratings; Numerical analysis; Optical modulation; Photonic crystals; Plasmons; Slabs; Surface waves; Smith-Purcell radiation (SPR); counter-streaming electron beams (CSEBs); plasmon;
Conference_Titel :
Vacuum Electronics Conference, 2006 held Jointly with 2006 IEEE International Vacuum Electron Sources., IEEE International
Conference_Location :
Monterey, CA
Print_ISBN :
1-4244-0108-9
DOI :
10.1109/IVELEC.2006.1666241
