Principle of terahertz radiation using electron beams

Abstract

This part introduces high power THz coherent radiation sources that take advantage of free electron beams. Following a description of characteristics on vacuum electron devices (VEDs), fundamental radiation principle of beam-wave interaction is explained with specifying their types and applications. Conventional high power microwave VEDs such as klystrons, TWTs, gyrotrons, and FELs are described in their technical perspectives with brief overview of device characteristics. Addressing technical challenges on up-conversion-to-THz of conventional approach, this part explores the state-of-the-art micro-VEDs considered for modern THz applications such as communication, imaging, sensing, spectroscopy, and so on, which are combined with modern microfabrication technologies. Novel MEMS techniques to microminiaturize RF components such as electron gun and RF interaction circuits are also presented.