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The detection characteristics of point-contact W-Ni diodes at 10 MHz, 9.5 GHz, and 28.3 THz are investigated as a function of diode resistance (contact pressure). The experimental results are compared with predictions from tunneling theory taking into account circuit parameters. Good agreement is obtained when the relaxation behavior of the metallic whisker antenna is considered at infrared wavelengths.

The responsivity of the tungsten-nickel point contact diodes for the CO2 laser is investigated as functions of the contact pressure and the oxide thickness on the nickel post in order to determine the detection mechanisms of point contact MIM diodes at 10.6 µm. The data are compared with the current-temperature (I–T) characteristics and the theory based on the equivalent circuit model. A comparison of the above data and the I–T characteristics indicates that the point contact MIM diode acts as a tunnel diode. It is confirmed, from a comparison of the above data and the theory based on the equivalent circuit model, that the MIM diode operates as a square-law detector for the CO2 laser.

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