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International Journal of Infrared and Millimeter Waves

Millimeter wave response of Nb-Pb-Nb planar Josephson junction

Shigeru Yoshimori, M. Kawamura

Published Mar 1, 1986• 1 citation
Publisher
DOI
10.1007/bf01010850

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Nb-Pb-Nb Planar Josephson Junction Fabricated by RIE

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Nb-Pb-Nb planar Josephson junctions were fabricated by electron-beam exposure and Reactive-Ion-Etching (RIE) and their response characteristics under millimeter-and submillimeter-wave radiation were investigated. The size of the weak-link was 0.67-1.0 micrometers long, 5.0 micrometers wide and 1000Å thick. The fourth Shapiro step under 70 GHz millimeter-wave radiation could be observed. On the other hand, the planar junctions showed only a bolometric response under 891 GHz submillimeter-wave radiation. In this paper, the characteristics of RIE using a CBrF3 gas as the etchant and an electron beam resist, PMMA, as the mask material are also discussed.

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Untuned Josephson detectors of microwave and millimeter-wave radiation

C. K. So, William O. Hamilton

The intrinsic response of Josephson junctions to microwave and far-infrared radiation is studied. Junctions are formed by pressing a Nb or Nb-Ti pointed wire onto a Nb thin film which in turn is pressed against the open end of a waveguide. Electromagnetic radiation is applied through the back of the film so that only the wave magnetic field is coupled to the junction. The change of the dc Josephson current is monitored at different levels of microwave power over a frequency range from 22 to 105 GHz. The dependence of the responsivity of these currents on film thickness over a range from 50 to 500 Å is studied. The observed responsivity agrees very well with that predicted by theory. Higher responsivity is observed for thinner films and lower microwave frequencies. The observed responsivity of a 50-Å film junction at 22 GHz is (6±3) ×10−2 V/W. To facilitate comparison of our results with other experiments, a more conventional coupling configuration in which the wave electric field rather than the wave magnetic field is coupled to the junction is studied. The results are comparable with other experiments with the responsivity in the E field coupling case 106 times larger than in the B field coupling configuration. We demonstrate that for successful use of simple Josephson junction detectors in the microwave and millimeter region it seems crucial to impedance match the junctions to the radiation source, probably by making them a part of a resonant structure.

Journal of Applied Physics•May 1, 1977•1 citation
Nb-Pb-Nb planar Josephson junctions were fabricated by electron-beam exposure and Reactive-Ion-Etching (RIE) and their response characteristics under millimeter-and submillimeter-wave radiation were investigated. The size of the weak-link was 0.67-1.0 micrometers long, 5.0 micrometers wide and 1000Å thick. The fourth Shapiro step under 70 GHz millimeter-wave radiation could be observed. On the other hand, the planar junctions showed only a bolometric response under 891 GHz submillimeter-wave radiation. In this paper, the characteristics of RIE using a CBrF3 gas as the etchant and an electron beam resist, PMMA, as the mask material are also discussed.
The intrinsic response of Josephson junctions to microwave and far-infrared radiation is studied. Junctions are formed by pressing a Nb or Nb-Ti pointed wire onto a Nb thin film which in turn is pressed against the open end of a waveguide. Electromagnetic radiation is applied through the back of the film so that only the wave magnetic field is coupled to the junction. The change of the dc Josephson current is monitored at different levels of microwave power over a frequency range from 22 to 105 GHz. The dependence of the responsivity of these currents on film thickness over a range from 50 to 500 Å is studied. The observed responsivity agrees very well with that predicted by theory. Higher responsivity is observed for thinner films and lower microwave frequencies. The observed responsivity of a 50-Å film junction at 22 GHz is (6±3) ×10−2 V/W. To facilitate comparison of our results with other experiments, a more conventional coupling configuration in which the wave electric field rather than the wave magnetic field is coupled to the junction is studied. The results are comparable with other experiments with the responsivity in the E field coupling case 106 times larger than in the B field coupling configuration. We demonstrate that for successful use of simple Josephson junction detectors in the microwave and millimeter region it seems crucial to impedance match the junctions to the radiation source, probably by making them a part of a resonant structure.