Chip-Scale Generation of Coherent THz Frequency Combs and Radiation

We report the generation of coherent THz frequency combs in high-Q nonlinear microcavities. Driven by a continuous-wave laser and with Lugiato-Lefever formalism, the efficient THz Turing pattern has exceptional robustness and is observed in two-accompanying differential resonators. Square-spectrum combs are also observed, towards THz radiation.