Research on New Grating Structure Based on 340GHz Super Smith-purcell Radiation

In this paper, a new grating structure based on Smith-Purcell superradiation is studied. Smith-Purcell super-radiation is coherent Smith-Purcell radiation generated by free electrons swept over the surface of the grating. Its frequency is a multiple of the surface wave. In this paper, the structure and size of the grating were optimized through simulation. The terahertz wave at 340GHz was obtained under the electron beam of 15keV. Compared with the ordinary grating structure, it shortened the oscillation time and reduced the required current density. The waveform is also more stable. The research in this paper is of great significance for the realization of compact, adjustable, high-frequency terahertz radiation sources.