Fast nonlinear photoresponse of current biased thin-film Bi2Sr2CaCu2O8 to pulsed far-infrared radiation
- 3 June 1991
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 58 (22) , 2549-2551
- https://doi.org/10.1063/1.104823
Abstract
The response of a polycrystalline thin‐film Bi2Sr2CaCu2O8 superconducting stripe to short‐pulse far‐infrared (λ=447 μm) radiation is reported. Under constant current bias, a photosignal is generated when the maximum zero voltage current is exceeded. Measurements of the sensitivity as a function of temperature, bias current, and intensity reveal the signal source to be nonbolometric. The response is found to obey a (power)1/2 law over more than 2 orders of magnitude. We believe the detection mechanism arises from the interaction of grain boundary Josephson junctions with radiation induced screening currents.Keywords
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