High Quality-Factor Cascaded Photonic Crystal Cavity for Phase Noise Reduction in Terahertz Local Oscillator Signal

We propose a low-loss one-dimensional cascaded photonic crystal cavity with high-quality factor integrated into an unclad silicon waveguide. This cascaded cavity is conceptually analyzed by temporal coupled mode theory, and its performance is validated using full-wave simulation. The cavity exhibits a high-quality factor combined with high transmission efficiency, which holds potential to precisely select the desired single-frequency component of a local oscillator signal. The simulated results of the proposed cavity show a quality factor of 9,161 at 275 GHz.