一种宽带瓦量级交错双栅脊波导返波振荡器的研究

Investigation of a wide band watt level backward wave oscillator based onridged double staggered grating waveguide

为满足太赫兹领域对大功率、宽带宽的太赫兹辐射源的需求,提出了一种新型交错双栅脊波导(RDSG)慢波结构。设计并优化了交错双栅脊波导返波振荡器的高频结构,同时对交错双栅脊波导和常规交错双栅的高频特性进行了仿真和对比,结果表明:当二者相速度接近时,交错双栅脊波导拥有更宽的“冷”通带带宽和更高的耦合阻抗。PIC仿真结果表明,在1 THz频段,交错双栅脊波导返波振荡器拥有超过175 GHz的可调谐带宽以及1.1 W的输出功率,比相同工作条件下的常规交错双栅结构输出功率了提高34%~42%。

A novel ridged double staggered grating(RDSG)slow wave structure(SWS)is put forward todevelop the wide-band and high-power terahertz radiation source for meeting the demand of thriving field of terahertz.The high frequency structure of backward wave oscillator(BWO)is designed and optimized,meanwhile highfrequency characteristics of RDSG and double staggered grating(DSG)are simulated and compared,indicating thatRDSG has a higher‘cold’bandwidth and more prominent interaction impedance when their phase velocity areadjusted to basically the same.PIC simulation results show that,ridged double staggered grating backward waveoscillator has a tunable bandwidth more than 175 GHz,and it can generate more than 1.1 W output power which is34%~42%higher than BWO implemented with conventional DSG in the frequency range around 1 THz.