Design and simulation of widely tunable picosecond synchronously pumped terahertz parametric oscillator based on silicon waveguide platform

A picosecond synchronously pumped terahertz optical parametric oscillator based on silicon membrane waveguide (Si-based WTPO) is proposed and numerically simulated. Through designing the structure parameters of the silicon membrane waveguide, a broadband terahertz frequency range is obtained by satisfying the phase matching condition. The parametric oscillation process and output characteristics of Si-based WTPO are numerically analyzed by solving the four-wave mixing coupled-wave equations, and the result has indicated that the parametric oscillation within the resonant cavity can apparently enhance the output terahertz wave power. Meanwhile, high bandwidth and efficiency output terahertz wave can be obtained, and too high pump power will lead to a reaction of reverse conversion. Finally, the threshold pump power is calculated. The Si-based WTPO system we proposed is expected to make some contributions to the study of compact and efficient terahertz wave sources.