基于光子晶体慢波结构的太赫兹返波管研究

Research on Terahertz Backward-Wave Oscillator Based on Photonic Column Array Slow-Wave Structure

研究了一种光子晶体的慢波结构,通过对该结构的色散、场分布和粒子模拟计算,设计和仿真了一个0.28-THz的带状注返波管。在阴极电流密度仅10 A/cm^(2)(最小可低于6 A/cm^(2)),电压12.5 kV,磁场0.5 T的情况下,该结构通过与带状电子注浸没式互作用,输出功率为435 mW。在此基础上,采用了LIGA加工技术制备了该慢波结构。研究表明,光子晶体结构能有效提高互作用效率和降低起振电流密度,有效提高太赫兹真空电子器件阴极的使用寿命,是提高太赫兹真空辐射源性能的一种有效途径。

This article explores a photonic column array slow-wave structure(SWS).A 0.28-THz sheet beam backward-wave oscillator(BWO)was designed and simulated by calculating the dispersion,field distribution and particle simulation.When the cathode current density is only 10 A/cm^(2)(the minimum is less than 6 A/cm^(2)),the voltage is 12.5 kV and the magnetic field is 0.5 T,the structure interacts with the sheet beam by immersion and the output power is 435 m W.On the basis of previous work,the SWS was fabricated using LithographyGalvanoformung-Abformung(LIGA)fabrication technology.The results show that the column array structure can effectively improve the interaction efficiency and reduce the starting current density;and effectively improve the lifespan of terahertz(THz)vacuum electron device(VED)cathodes,which is a viable means of increasing the performance of THz vacuum radiation sources.