Generation of microwaves at frequencies above 100 GHz with a GaAs/AlAs superlattice

We report on the generation of microwaves at frequencies above 100 GHz with a semiconductor superlattice device. We made use of the negative differential conductivity of an n-doped GaAs/AlAs superlattice. In this contribution we report on a higher harmonic superlattice oscillator for radiation at 175 GHz with a power of the order of 100 μW. The oscillator consisted of a superlattice device, mounted in a cavity and connected via a coaxial line with a bandstop filter (stopband from 75 GHz to 200 GHz) to a bias supply. Beside the emission at 175 GHz, oscillations at 35 GHz and 70 GHz occurred in the bias circuit.