THz wave radiation source with oval groove grating structure

Abstract

The invention provides a THz wave radiation source with an oval groove grating structure. The oval groove grating with periodicity is adopted as a beam-wave interaction structure of the radiation source. When an electron beam passes through the structure at a certain speed, the electron beam and surface slow waves interact to be clustered and generate an electron beam cluster, then Smith-Purcell coherent radiation is stimulated, radiation is collected through a flat plate or a curved mirror (metal or medium) to generate tunable, compact and high-power THz waves, and therefore the THz wave radiation source can be easily applied to communication, radars, electronic countermeasures, electromagnetic weapons, astronomy, medical imaging, nondestructive detection, safety inspection and other aspects.

Description

technical field [0001] The invention relates to the field of vacuum electronics terahertz technology, in particular to a Smith-Purcell effect THz wave radiation source with an elliptical groove grating structure. Background technique [0002] Terahertz (THz for short) wave is a kind of electromagnetic radiation between far-infrared light wave and microwave millimeter wave, its frequency is from 100GHz to 10THz (1THz=10 12 Hz), the corresponding wavelength is from 3 millimeters to 30 microns, THz waves occupy a very special position in the electromagnetic spectrum, and its unique properties give communication, radar, electronic countermeasures, electromagnetic weapons, astronomy, medical imaging, non-destructive testing, security inspections, etc. field has had a profound impact. Nowadays, THz technology has been used in the research of materials, life sciences, communications, agriculture and national security, forming multiple interdisciplinary research fields. However, a...

AI Technical Summary

Problems solved by technology

However, an urgent problem to be solved is: how to obtain a high-power, compact and tunable room-temperature THz wave radiation source? Because no matter from the electrical or optical point of view, ordinary optoelectronic devices have a limit near the THz frequency: it is difficult for electronic devices to exceed this THz frequency, and it is difficult for optical devices to lower this THz frequency.

In the experiment, the stepped grating was used as the injection-wave interaction structure, which has the advantage of improving the efficiency, but the generation of pre-clustered electron bunches requires a huge accelerator device, which limits its wide application.

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