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Achieving efficient terahertz (THz) generation using compact turn-key sourcesoperating at room temperature and modest power levels represents one of thecritical challeges that must be overcome to realize truly practicalapplications based on THz. Up to now, the most efficient approaches to THzgeneration at room temperature -- relying mainly on optical rectificationschemes -- require intricate phase-matching set-ups and powerful lasers. Herewe show how the unique light-confining properties of triply-resonant photonicresonators can be tailored to enable dramatic enhancements of the conversionefficiency of THz generation via nonlinear frequency down-conversion processes.We predict that this approach can be used to reduce up to three orders ofmagnitude the pump powers required to reach quantum-limited conversionefficiency of THz generation in nonlinear optical material systems.Furthermore, we propose a realistic design readily accesible experimentally,both for fabrication and demonstration of optimal THz conversion efficiency atsub-W power levels.

Efficient low-power terahertz generation via on-chip triply-resonant nonlinear frequency mixing