Abstract
Tungsten whisker-nickel point-contact (W-Ni) diodes have been used to investigate fourth-, fifth-, sixth-, and seventh-order harmonic mixing processes in the frequency range of 30–120 THz. The beat notes obtained by these processes have been measured as a function of the applied bias voltages of the diode. The results were compared with the corresponding derivative evaluated by a polynomial fit of the dc current-voltage (I–V) characteristic of the diode. It was found that the beat signals obtained by the various processes can in most cases be described qualitatively by the dc I–V characteristic of the diode.
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