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采用轴向电场分解与PIC(Particle-in-cell)模拟相结合的方法,研究了二极管参数、引导磁场和输出结构等因素对0.14 THz过模表面波振荡器输出太赫兹波模式的影响。当太赫兹波实现稳定输出时,其模式成分和相对相位差基本不受二极管电压的上升沿、幅度和引导磁场大小的影响,除非振荡器的工作状态发生了明显改变,但它们对阳极半径和阴阳极间距的变化较为敏感。在较小的二极管电压、阳极半径或阴阳极间距下振荡器能获得一定成分的TM01模太赫兹波输出。输出结构决定了输出太赫兹波的模式成分。通过合理设计锥形输出结构的参数,能够实现相同功率水平下的纯净TM01模输出,简单有效地解决过模表面波振荡器的多模输出问题。
The effects of diode parameters, leading magnetic field and output structure on the output THz mode of 0.14 THz over-mode surface wave oscillator are investigated by the combination of axial electric field decomposition and PIC (Particle-in-cell) simulation. When the terahertz wave reaches a stable output, its mode component and relative phase difference are basically unaffected by the rising edge, the amplitude and the magnitude of the guiding magnetic field of the diode unless the operating conditions of the oscillators change significantly, but their effects on the anode radius and Yin and Yang spacing changes more sensitive. The oscillator achieves a TM01 mode THz output of a certain composition at a small diode voltage, anode radius or spacing between the anode and cathode. The output structure determines the mode component of the output terahertz wave. By reasonably designing the parameters of the tapered output structure, the pure TM01 mode output at the same power level can be achieved, and the multimode output problem of the over-mode surface wave oscillator can be solved simply and effectively.