Dr. James Murduck Profile

Dr. James Murduck

at Northrop Grumman Corp

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Proceedings Article | 1 July 1991 Paper

Infrared photodetector based on the photofluxonic effect in superconducting thin films

Alan Kadin, Michael Leung, Andrew Smith, James Murduck

Proceedings Volume 1477, (1991) https://doi.org/10.1117/12.45605

KEYWORDS: Superconductors, Photons, Infrared radiation, Infrared detectors, Thin films, Sensors, Superconductivity, Electrons, Infrared photography, Photodetectors

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The authors have recently proposed a new nonbolometric mechanism for detection of infrared photons in superconducting thin films, in which a photon nucleates the formation of a vortex- antivortex pair. This model predicts a limiting voltage responsivity of 1/(2ef), where f is the frequency of the radiation. Measurements on ultrathin NbN films at 4 K are reported which provide further evidence for this 'photofluxonic effect.' For approximately equals 0.1 (mu) W of red light (0.6 micrometers ), a responsivity of 6000 V/W of absorbed light has been measured, in agreement with the predictions. This response continues out to frequencies greater than 100 kHz, and is 1000 times greater than expected for a bolometric response. Preliminary measurements with 20 micrometers infrared radiation also agree with this picture. Voltage noise in the absence of light was less than 1 nV/(root)Hz, and was consistent with single-fluxon shot noise. Similar performance should also be possible using high-temperature superconductors. Some considerations for a fast, sensitive infrared detector based on these principles are presented.

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