An enhanced multicolor coherent SPR device and its control method

Abstract

The invention discloses an enhanced multi-color coherent SPR device and a control method thereof. With a metal composite grating, the depth of the groove is modulated periodically; and m grooves having different depths are included within one depth modulation period. A free electron beam flies over the surface of the metal composite grating and multi-color coherent SPR with (m-1) radiation frequencies are excited at most. Resonance modes distributed in the grooves having different depths are different within one depth modulation period; the high-frequency resonance mode is mainly distributed in the shallow groove, so that the adjustment of the radiation frequency is realized by adjusting the depths of the corresponding grooves; and the number of radiation frequencies is adjusted by adjusting the number of grooves in the depth modulation period. When the operating voltage of the electron beam changes, the radiation in each direction has the frequency-locking characteristic. The radiation frequency is increased to two orders of magnitude, so that the radiation efficiency is high; multiple coherent radiation frequencies are realized; the radiation structure is simple; no cluster electron beam is required; and the device is easy to realize in the micro-interaction circuit.

Description

technical field [0001] The invention relates to Smith-Purcell radiation technology, in particular to an enhanced polychromatic coherent Smith-Purcell radiation SPR device and a control method thereof. Background technique [0002] When the free electron beam flies over the surface of the metal periodic structure, it will excite a kind of free space radiation, also known as Smith-Purcell radiation (Smith-Purcell radiation, SPR), which has a wide range of applications in many fields. SPR is a kind of incoherent broad-spectrum radiation with low radiation intensity. These factors also limit the further development of SPR. How to increase the radiation intensity and obtain SPR with coherent spectrum has also been a research hotspot in recent years. At present, SPR with coherent spectrum and high radiation intensity is mainly realized through Smith-Purcell superradiation (Super-SPR). Super-SPR is based on clustered electron beams flying over the surface of a metal periodic struc...

AI Technical Summary

Problems solved by technology

Grouping electron beams based on photocathode is mainly used in particle accelerator devices, the experimental equipment is bulky, and it is difficult to micro-integrate

Although the clustered electron beam based on SSP modulation can be realized on a micro-interaction circuit, it requires a long interaction circuit, and at the same time, it is necessary to ensure that the electron beam maintains good focusing characteristics during long-distance transmission, which is difficult in the experimental process. accomplish

Therefore, Super-SPR is difficult in the actual implementation process, and it is necessary to find a simple and effective interaction structure to obtain high radiation power and coherent SPR

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