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Superconducting and Schottky mixers

E. Kollberg

Published Jan 1, 1985• 0 citations
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There are growing needs for low noise and wide band receiver in SMMW range, e.g., in radio astronomy [1]. Hitherto, Schottky diode mixer, Josephson mixer using point contact microbridges, and quasiparticle mixer using superconducting tunnel junctions have been investigated intensively in MMW range. Over wide SMMW range, however, only Schottky diode mixer was tested and used at present. Quasiparticle mixer now confronts a basic difficulty for operation in SMMW range, although it has very high potential as a SMMW mixer. On the otherhand, potential of Josephson mixer using microbridges is unclear.

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Josephson junctions are highly nonlinear and respond up to infrared frequencies. A wide variety of high frequency applications have been explored. In addition, several high frequency superconducting devices are being developed which do not use the Josephson effect. These include a superconducting version of the Schottky barrier diode for use as a heterodyne mixer and a video detector, and also a composite superconducting bolometer. In this review, the state of development of superconducting mixers, detectors, and parametric amplifiers at microwave, millimeter, and submillimeter wavelengths is discussed. Emphasis will be placed on developments which have taken place since 1974 when a previous review was circulated.

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Noise performance of quasioptical ultrathin NbN hot-electron bolometer mixer at 2.5 and 3.8 THz

Sergey V. Antipov, Yu.B. Vachtornin, S. N. Maslennikov +5 more

To put space-based and airborne heterodyne instruments into operation at frequencies above 1 THz the superconducting NbN hot-electron bolometer (HEB) will be incorporated into heterodyne receiver as a mixer. At frequencies above 1.3 THz the sensitivity of the NbN HEB mixers outperform the one of the Schottky diodes and SIS-mixers, and the receiver noise temperature of the NbN HEB mixers increase with frequency. In this paper we present the results of the noise temperature measurements within one batch of NbN HEB mixers based on 3.5 mn thick superconducting NbN film grown on Si substrate with MgO buffer layer at the LO frequencies 2.5 THz and 3.8 THz.

International Kharkiv Symposium on Physics and Engineering of Microwaves, Millimeter and Submillimeter Waves•Oct 26, 2004•0 citations
There are growing needs for low noise and wide band receiver in SMMW range, e.g., in radio astronomy [1]. Hitherto, Schottky diode mixer, Josephson mixer using point contact microbridges, and quasiparticle mixer using superconducting tunnel junctions have been investigated intensively in MMW range. Over wide SMMW range, however, only Schottky diode mixer was tested and used at present. Quasiparticle mixer now confronts a basic difficulty for operation in SMMW range, although it has very high potential as a SMMW mixer. On the otherhand, potential of Josephson mixer using microbridges is unclear.
Josephson junctions are highly nonlinear and respond up to infrared frequencies. A wide variety of high frequency applications have been explored. In addition, several high frequency superconducting devices are being developed which do not use the Josephson effect. These include a superconducting version of the Schottky barrier diode for use as a heterodyne mixer and a video detector, and also a composite superconducting bolometer. In this review, the state of development of superconducting mixers, detectors, and parametric amplifiers at microwave, millimeter, and submillimeter wavelengths is discussed. Emphasis will be placed on developments which have taken place since 1974 when a previous review was circulated.
To put space-based and airborne heterodyne instruments into operation at frequencies above 1 THz the superconducting NbN hot-electron bolometer (HEB) will be incorporated into heterodyne receiver as a mixer. At frequencies above 1.3 THz the sensitivity of the NbN HEB mixers outperform the one of the Schottky diodes and SIS-mixers, and the receiver noise temperature of the NbN HEB mixers increase with frequency. In this paper we present the results of the noise temperature measurements within one batch of NbN HEB mixers based on 3.5 mn thick superconducting NbN film grown on Si substrate with MgO buffer layer at the LO frequencies 2.5 THz and 3.8 THz.