Investigation of a wide band watt level backward wave oscillator based on ridged double staggered grating waveguide
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摘要: 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%。
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关键词:
- 太赫兹 /
- 宽带大功率返波振荡器 /
- 新型慢波结构 /
- 交错双栅脊波导 /
- 仿真计算
Abstract: A novel ridged double staggered grating (RDSG) slow wave structure (SWS) is put forward to develop 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 high frequency characteristics of RDSG and double staggered grating (DSG) are simulated and compared, indicating that RDSG has a higher ‘cold’ bandwidth and more prominent interaction impedance when their phase velocity are adjusted to basically the same. PIC simulation results show that, ridged double staggered grating backward wave oscillator has a tunable bandwidth more than 175 GHz, and it can generate more than 1.1 W output power which is 34%～42% higher than BWO implemented with conventional DSG in the frequency range around 1 THz. -
图 1 交错双栅脊波导三维结构及尺寸示意图
Figure 1. Schematic diagram of RDSG model structure and dimensions
图 2 1.03 THz处交错双栅脊波导和常规交错双栅的电场Ez分布图
Figure 2. Distribution of electric field Ez at the typical frequency of 1.03 THz of RDSG-SWS and DSG-SWS
图 3 交错双栅脊波导和常规交错双栅布里渊曲线及归一化相速度曲线图
Figure 3. Brillouin curves and normalized phase velocity of RDSG-SWS and DSG-SWS
图 5 CST MWS中交错双栅脊波导时域求解器模型.
Figure 5. Time-transient solver calculation model in CST MWS
图 8 交错双栅脊波导及常规交错双栅返波振荡器的输出功率、起振频率及电压关系示意图
Figure 8. Frequency versus beam voltage and output power versus frequency of RDSG-SWS and DSG-SWS BWO
表 1 交错双栅脊波导参数
Table 1. Parameters of RDSG-SWS
unit: µm length of SWS z width of SWS a width of grating l period length p height of grating h thickness of grating g height of beam channel 2b 125 180 90 55 50 13.75 25 
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