Abstract

We have investigated the submillimeter wave frequency responses of NbN/AlN/NbN tunnel junctions using quasi-optical coupling techniques and an optically-pumped far-infrared laser. A two junction array was integrated at the feeds of a bow-tie antenna. Measurements on the junctions were made by monitoring photon-assisted tunneling steps induced in the current-voltage characteristics. These n= ± 1 photon steps were clearly observed with irradiation at 303, 594, 693 and 762 GHz. The results suggest it will be possible to realize submillimeter wave mixers by using these junctions.

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