Quasiparticle mixers have shown promise as millimetre and submillimetre wavelength detectors and mixers, with the potential for conversion gain and photon noise limited performance. We report on small area (0.1μm2- 1.0μm2) superconducting thin film edge junctions fabricated using a combination of magnetron sputter deposition and broad beam ion source technology for materials deposition, barrier formation, and electrode patterning. Devices fabricated on0.1 × 0.4 ×4mm3quartz substrates with a wide range of normal state resistances,20 < Rₙ < 1000 critical current densities,10² < jc < 3 × 10⁵Acm-2, show steps due to photon assisted tunnelling with very small amounts of local oscillator power applied (10-8W). We have investigated a series of devices with various electrical characteristics and geometries all of which include integral superconducting choke structures. Results are presented and are compared with theoretical predictions.
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Naclerio et al. (1985) studied this question.
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