Fabrication of Superconductor-Insulator-Superconductor Devices for Heterodyne Mixer Applications with Electron Beam Lithography

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Superconductor-Insulator-Superconductor (SIS) junction devices are used as state of the art frequency mixers for radio astronomical heterodyne receivers and enable near quantum limited sensitivity up to about 1 THz.

In this work an enhanced fabrication scheme for SIS junction devices has been developed and implemented into regular device fabrication at KOSMA. Electron beam lithography in combination with a chemical mechanical planarization (CMP) process has considerably improved submicron junction area reproducibility and electrical device characteristics. The fabrication scheme demonstrates enough development potential for future THz frequency SIS mixer designs.