Abstract
We proposed a vacuum electronic device based on fleld emission mechanism for the generation of terahertz (THz) waves in a previous work (JVST B 23(2), 849, 2005). The preliminary simulation results showed that an electronic e-ciency up to 4% can be achieved with no external magnetic flelds applied. However, the interaction mechanism is not clear. In the present work, the interaction mechanisms are studied. The MAGIC code is used to investigate the interactions between the electrons and the THz waves. To understand the interaction mechanism, the cathode has been trimmed to emit electrons. The simulation results show that the e-ciency of the case corresponding to the trimmed cathode is higher than that of the original planar cathode. The interaction regions are located among the gaps between the cathode and the anode. The AC electric flelds of the THz waves not only velocity-modulate the electron beam but also cause the density modulation of the fleld emission current. This pre-bunching efiect provides the feedback loop as required by an oscillator.
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