THz wakefield in dielectric PBG structure driven by electron bunches

The wakefield effects driven by a relativistic electron bunch train in dielectric PBG structure are presented here. The energy of electron beam can be modulated by self-wake or laser modulation. The excited narrow-band THz wakefield is confined in the defect of 2-D dielectric structure when bunches travel through the PBG structure. And the other spectrum signals are freely radiated through the PBG structure.