Device fabrication

For the University of Illinois Department of Astronomy, developed a submillimeter wavelength heterodyne receiver for astronomy, based on SIS quasiparticle tunnel junctions. Junction and receiver fabrication utilized many photolithographic and cryogenic techniques, and antenna and optical systems design.

Surface physics

As part of a program to sense H2 gas levels with a solid-state sensor, modeled the detailed balance and non-equilibrium transition rates of hydrogen and oxygen in metals, including surface effects, boundary layer sites, and bulk concentrations. At the capacitor interface layer, fermi gas balance and the chemical potential were computed using standard quantum/statistical mechanics. These models were used in conjunction with estimation theory to generate external H2 gas concentrations. Details on the physics used are found here.

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