基于光子晶体慢波结构的太赫兹返波管研究

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/cm2(最小可低于6 A/cm2)，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。

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

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/cm2 (the minimum is less than 6 A/cm2), 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 mW. On the basis of previous work, the SWS was fabricated using Lithography-Galvanoformung-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.