Abstract
Submillimeter-wave focal plane arrays based on superconducting direct detectors are designed to be used on a new 10-m submillimeter-wave telescope in Chile. Niobium tunnel junctions with low leakage current coupled to antenna structures can be sensitive submillimeter-wave direct detectors when high quantum efficiency and low leakage current are realized. Inhomogeneous distributed junctions coupled to log-periodic antennas can be used to realize this. Input coupling of better than 50% is calculated with a bandwidth of more than 60 GHz using low current density inhomogeneous distributed junctions. Their measured leakage current of 5 pA and their shot-noise limited operation suggests that noise equivalent power of less than 10/sup -17/W/Hz/sup 0.5/ at operating temperature of 0.9 K could be achieved.
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