Superconducting tunnel junction bolometers

Clarke, John; Hoffer, G. I.; Richards, P. L.

doi:10.1051/rphysap:019740090106900

Cited by 26 publications

(9 citation statements)

References 3 publications

(1 reference statement)

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“…The resulting NEP=1.7x1o-15 WHz-1/2 with a response time t=83 ms, is comparable to, but not better than, composite bolometers with semiconducting thermometers operated at the same temperature [52] and much less sensitive than semiconducting bolometers operated at lower temperatures. Similar performance was obtained with bolometers which used SNS and SIN tunnel junction thermomgters at 1.5 K and SQUID readouts [53]. None of these bolometers are used because they have similqr performance to the semiconductor bolometers, but the electronic systems are more complicated.…”

Section: Superconducting Bolometersupporting

confidence: 52%

Superconducting components for infrared and millimeter-wave receivers

Richards

1989

Proc. IEEE

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Section: Superconducting Bolometersupporting

confidence: 52%

Superconducting components for infrared and millimeter-wave receivers

Richards

1989

Proc. IEEE

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“…The SNS bolometer is based on the temperature dependence of the critical current in a superconductor-normal metal-superconductor (SNS) junction (Clarke, et al , 1974 Typical structure for a composite bolometer (after Clarke, et al, 1978 Experimental results so far support this conclusion.…”

Section: Fundamental Principles Governing Digital Logic Devicesmentioning

confidence: 99%

The role of superconductivity in the space program :

Sullivan

1978

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This report describes the results of a study designed to assess the role which superconductivity might play in the U.S. Space Program. The study was performed by members of the staff of the Boulder Laboratories of the National Bureau of Standards.Six technical subject areas were considered; high field magnets, magnetometers, digital electronics, high-frequency detectors, instruments related to gravitational studies and ultra high-Q cavities.The study identifies a number of applications of superconductivity which are of potential interest to NASA. Wherever possible, the devices are related to specific types of space missions.Keywords: Computers; digital electronics; gravitational studies; high-Q cavities; infrared detectors; magnetometers; magnets; microwave detectors; space; superconductivity. IMPORTANT NOTICECertain companies and commercial equipment are identified in this report. This identification does not imply endorsement by the National Bureau of Standards nor does it imply that the equipment identified is necessarily the best available for the purpose. properly applied to magnet structural components, could make impressive reductions in the specific weight of large magnets.It is suggested that mater-Lais programs, directed toward magnet weight reduction, be stimulated by NASA in order to provide a base for optimization of the specific weight of superconducting magnet systems.The reduction of specific weights could provide longer term benefits to the space program.Many of the more ambitious programs for space colonization and travel involve superconducting magnets (e.g., fusion reactors or MHD generators for energy production, the mass-driver system, plasma or MHD propulsion engines, etc.). Low-Frequency Superconducting SensorsThe primary device in this class is the SQUID (Superconducting QUantum Interference The suggestions for experiments on gravitational theories are many, and it is difficult to select any one for special encouragement. It might be best to let the individual researchers develop their proposals to a higher level before any major commitments are made.Obviously these researchers will need minor funding for this work. High-Q CavitiesThere are many applications for superconducting high-Q cavities, but for space applications the most prominent is the use of such cavities as stabilizing elements in clocks and oscillators.The best Q for a superconducting cavity achieved to date is 5 x 10^, and the best stability is 3 x 10^.Since it is generally possible to find the center of a reso--18 nance line to one part per million, it is reasonable to expect that a stability of 2 x 10 will be achieved using present technology. This might be accomplished within ten years. On the other hand, large increases in Q values will require major advances in superconducting technology. The likelihood of it happening within the next ten years cannot be reasonably assessed.One intriguing potential space application of these oscillators is their use for ranging.The possibility that gravitational radiation migh...

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“…A bolometer is a rectification device that converts an electromagnetic wave into resistance or voltage change through heat generation; 1 such a device may be used to detect weak electromagnetic waves in radio astronomy and thermography 2 . Various types of bolometers such as semiconductor 3 – 5 , superconductor 6 – 8 , and carbon bolometers 9 , 10 have been developed for detecting infrared and millimeter wavelength radiation. Cooled bolometers using a graphene system have been developed over the last two decades and exhibit high responsivity: 11 , 12 Fatimy et al have reported a very high responsivity of 5 × 10 10 V/W at 2.5 K 11 .…”

Section: Introductionmentioning

confidence: 99%

Uncooled sub-GHz spin bolometer driven by auto-oscillation

et al. 2021

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Bolometers are rectification devices that convert electromagnetic waves into direct current voltage through a temperature change. A superconducting bolometer has a responsivity of approximately 106–107 V/W under cryogenic temperatures at infrared wavelengths; however, no devices have realized such a high responsivity in the sub-GHz frequency region. We describe a spin bolometer with a responsivity of (4.40 ± 0.04) × 106 V/W in the sub-GHz region at room temperature using heat generated in magnetic tunnel junctions through auto-oscillation. We attribute the unexpectedly high responsivity to a heat-induced spin-torque. This spin-torque modulates and synchronizes the magnetization precession due to the spin-torque auto-oscillation and produces a large voltage output. In our device, heat-induced spin-torque was obtained because of a large heat-controlled magnetic anisotropy change: −2.7 µJ/Wm, which is significant for enhancing dynamic range and responsivity. This study can potentially lead to the development of highly sensitive microwave detectors in the sub-GHz region.

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Superconducting tunnel junction bolometers

Abstract: Two newSome improvement in these values is anticipated.-2-LBL-2222

Cited by 26 publications

References 3 publications

Superconducting components for infrared and millimeter-wave receivers

Superconducting components for infrared and millimeter-wave receivers

The role of superconductivity in the space program :

Uncooled sub-GHz spin bolometer driven by auto-oscillation

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