Millimeter radiation obtained by difference-frequency mixing of the P(20) and P(22) lines of the CO2 laser has been used to investigate the polarization, radiation pattern, and bias characteristics of metal-barrier-metal point-contact diodes. The results are consistent with antenna theory and the electron tunneling model of the point contact. Significant enhancement in performance is expected with eventual use as a submillimeter source.
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T. Kenneth Gustafson (1974) studied this question.
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