Development of millimeter-wave/THz-wave generation devices utilizing a high-Q resonator and nonlinear-optical difference frequency generation

详细研究了矩形波导谐振腔中利用非线性光学差频产生的新型毫米波/太赫兹波信号产生装置。通过基于耦合模理论和时域有限域（FDTD）方法的详细分析，确定了器件的基本工作原理，设计了工作在60ghz频段的原型器件。在实验中，利用LiTaO3晶体成功地实现了60GHz信号的产生。所产生的DFG信号的频率响应实测值与理论值吻合较好。此外，还提出了DFG技术在光学交叉/自相关器件中的应用，并从理论上展示了预期的特性。讨论了与标准矩形波导电路的融合以及太赫兹范围内高频信号的产生。

New millimeter-wave/terahertz-wave signal generation devices utilizing nonlinear optical difference frequency generation (DFG) in a rectangular waveguide resonator were studied in detail. By using detailed analyses based-on the coupled-mode theory and the finite-domain time-domain (FDTD) method, basic device operations were identified and a proto-type device operating in the 60GHz-band was designed. In the experiment, 60GHz signal generation was successfully demonstrated in the fabricated device using LiTaO3 crystal. The measured frequency response of the generated DFG signal was in good agreement with the theoretical one. In addition, the applications of the DFG technique to optical cross-/auto-correlation devices were also proposed and expected characteristics were shown theoretically. The fusion with standard rectangular waveguide circuits and higher frequency signal generation in the terahertz ranges were also discussed.