Terahertz radiation source based on special Smith-Purcell effect

Abstract

The invention discloses a terahertz radiation source based on a special Smith-Purcell effect. The terahertz radiation source comprises an electronic gun (1), metal rectangular gratings (3), a collector (4), a metal flat reflector (6) and an output port (8), wherein the electronic gun (1) is opposite to the collector (4), the metal rectangular gratings (3) are arranged between the electronic gun (1) and the collector (4), the metal flat reflector (6) is disposed above the metal rectangular gratings (3), and the output port (8) is arranged at the metal flat reflector (6). According to the invention, the oscillation-starting current density of an electron beam can be substantially reduced, through adjusting the distance from the reflector to the gratings, the terahertz radiation source can work at a lowest mold or a secondary mode in a controllable way, the structure is simple, required work voltages are low, huge external additional equipment is unnecessary, and miniaturization and integration are quite easily realized.

Description

technical field [0001] The invention belongs to the field of vacuum electronics, in particular to a terahertz radiation source based on the specific Smith-Purcell effect. Background technique [0002] Terahertz waves refer to electromagnetic waves with a frequency between 0.1-10THz, which is the only wave band in the electromagnetic spectrum that has not been fully developed so far. Because of its broad application prospects in many fields such as life science, material science, communication technology and national security, it has attracted widespread attention from scientists at home and abroad. Terahertz science and technology is gradually taking shape as an emerging discipline. The development of terahertz sources is the basis for the development of terahertz science and technology, and it is also the main bottleneck restricting the development of terahertz science and technology. [0003] Traditional vacuum electronics electromagnetic radiation sources based on the in...

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Problems solved by technology

[0005] However, the traditional Oro tube uses ordinary incoherent Smith-Purcell radiation. Usually, the radiation intensity of ordinary Smith-Purcell radiation is extremely low, and the radiation wave diverges to all directions. The standing wave in the open resonant cavity Field excitation and amplification also requires electron beams with extremely high current density, which brings great challenges to the emission capability of the cathode and the bunching of electron beams

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