Theoretical Simulation of the Mixing Performance of Distributed Superconducting Tunnel Junction Arrays at 1.2THz(<Special Section>Innovative Superconducting Devices and Their Applications)

概要

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In this paper we focus on the numerical simulation of the mixing behaviors of distributed superconducting junction arrays at 1.2THz. A novel type of superconducting tunnel junctions, i.e., NbN/AlN/Nb, which have a relatively high gap voltage (4.3mV) and can reach a critical current density as high as several tens of kA/cm^2, are proposed for this characterization along with conventional Nb/AlOx/Nb junctions. The former is incorporated with a NbN/SiO_2/Al tuning circuit, and the latter with a Nb/SiO_2/Al and a NbTiN/SiO_2/Al tuning circuits. The noise performance, local-oscillator power requirement, IF bandwidth, and optimum embedding impedance are thoroughly characterized for the two types of distributed superconducting junction arrays.
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2007-03-01