One THz harmonic oscillation of resonant tunneling diodes

One THz harmonic oscillation was observed in a sub-THz oscillating GaInAs/AlAs resonant tunneling diode integrated with a slot antenna. The fundamental and third-harmonic frequencies were 342 GHz and 1.02 THz, respectively, for a 50 mu m long antenna. The maximum output power of the fundamental mode was around 23 mu W, and that of the third-harmonic component was 2.6% of the fundamental. Theoretical analysis with the van der Pole equation qualitatively explained the measured results. (c) 2005 Americian Institute of Physics.