1 THz harmonic generation from sub-THz oscillating resonant tunnelling diode

1 THz harmonic generation was observed in sub-THz oscillating GaInAs/AlAs resonant tunneling diode integrated with slot antenna. The fundamental and 3rd harmonic frequencies were 342 GHz and 1.02 THz, respectively, for 50-micron-long antenna. Maximum output power of the fundamental mode was around 23 /spl mu/W, and that of the 3rd harmonic component was 2.6% of the fundamental.