Planar Schottky diode frequency multiplier for molecular spectroscopy up to 1.3 THz

We present a novel and compact frequency multiplier design for broad-band spectroscopy up to 1.38 THz. The multiplier generates harmonics of a fundamental frequency between 110 and 240 GHz. The key element of the multiplier is a newly developed planar Schottky diode. Harmonic power generation is optimized with the aid of three tuning elements. The performance of the multiplier was checked spectroscopically.