Superlattice devices applications in THz frequency range

The results of the planar diodes based on semiconductor quantum superlattice (SL) applications for direct and coherent detection, harmonics generation in terahertz frequency range is presented. The study used planar diodes with small active area size 1-2 mu m2. To fabricate the diodes were grown by molecular beam epitaxy structure heavily doped superlattices with miniband width 24meV. The experimental dependence of Volt -Watt sensitivity unbiased or biased planar SL diodes in frequency range 1-4.5THz is shown. Coherent detection of of the radiation from BWO and quantum cascade laser (QCL) by using unbiased SL planar diodes with supplementary low frequency (10-200GHz) pump source is demonstrated. The power spectrum of output signal frequency multiplier with the input pump of 140-160GHz is measured in frequency range 0.4-8.1THz.