Abstract

A new radiation scheme, which adopts the high-order harmonics of a train of electron bunches to excite the high-order guided mode, is proposed and investigated by numerical simulations. By applying this scheme, the radiation with frequency close to 1 THz is generated from a waveguide with relatively big-size structure, and the bunching frequency is much lower than the radiation frequency. This scheme may offer a promising candidate for practical terahertz source since it breaks the two main bottlenecks of the vacuum electronic devices in the terahertz region: very tiny-size structure and unapproachable electron beam.

© 2015 Optical Society of America

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