Progress toward solid-state local oscillators at 1 THz

A varactor tripler to 800 GHz with 250 mW output power is reported. This tripler uses a new GaAs Schottky diode which has been optimized for high frequency applications. It features a smaller anode diameter and higher epitaxial doping density than previous varactor multipliers. The resulting output power is much greater than has been previously reported at such a high frequency.