Nonreciprocal wave propagation in multilayer semiconductor films at frequencies up to 200 GHz

Three multilayer gyrotropic thin-film semiconductor waveguides comprising S-I GaAs/AlAs/n-GaAs/AlGaAs in a static magnetic field of 0.15 T have been analyzed over the frequency range of 0-200 GHz. The dispersion diagrams and field distributions show nonreciprocal propagation, and forward waves and backward waves depending on the order in which the films are stacked. Potential applications such as miniature phase shifters and isolators in the frequency range of 50-100 GHz with lengths of the order of micrometers are briefly discussed.