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

In this letter, we show theoretically how the light-confining properties of triply-resonant photonic resonators can be tailored to enable dramatic enhancements of the conversion efficiency of terahertz (THz) generation via nonlinear frequency down-conversion processes. Using detailed numerical calculations, we predict that this approach can be used to reduce up to three orders of magnitude the pump powers required to reach quantum-limited conversion efficiency of THz generation in conventional nonlinear optical material systems. Furthermore, we propose a realistic design readily accessible experimentally, both for fabrication and demonstration of optimal THz conversion efficiency at sub-W power levels.National Science Foundation (U.S.) (MRSEC DMR-0819762)United States. Army Research Office. Institute for Soldier Nanotechnologies (Contract No. W911NF-07-D-0004