Tunable THz source using superconducting tunnel junctions
2013
We report on tunable submillimeter-wave radiation sources based on micrometer-sized superconducting tunnel junction
arrays optimized within a bandwidth of 350-520 GHz. The arrays consist of 10, 20 and 40 Superconductor-Insulator-
Superconductor (SIS) parallel-connected Nb/AlO x /Nb junctions embedded in superconducting microstrip lines. A SIS
twin-junction is integrated along with each array to detect output signals. The pumped detector’s I-V characteristic
exhibits clearly photon-assisted quasiparticule steps when the arrays are biased upon corresponding Josephson
resonances ranging from 370 to 520 GHz.
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