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An all-NbN quasi-optical superconductor-insulator-superconductor (SIS) mixer for the terahertz band has been designed and tested. This mixer consists of a MgO hyperhemispherical lens with anti-reflection cap, an NbN twin-slot antenna, and NbN tuning circuits. The size of the NbN/AlN/NbN junction was about 0.5μm in diameter, and the current density was about 30 kA/cm 2 . The junctions showed...
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