Optimized design for a terahertz parametric oscillator based on degenerate four-wave mixing in silicon nitride

We propose terahertz wave generation using a parametric oscillator based on phase-matched and non-phasematched degenerate four-wave mixing processes within a silicon nitride Fabry-Perot microcavity. The central frequency of the generated terahertz waves would be tunable over the frequency range of 3.6-5.73 THz by varying the wavelength of the pump wave. The best phase-matching condition is achieved at a frequency of 5 THz, and an optimum peak power of 329 W is obtained at a frequency of 4.29 THz. (C) 2020 Optical Society of America