Abstract
We present a theory of noise equivalent power (NEP) and relatedparameters for a high-temperature superconductor (HTSC) bolometer in whichtemperature and resistance are the noise sources for open circuitoperation and phonon and resistance are the noise sources for voltage-biasedoperation of the bolometer. The bolometer is designed to use aphoto-thermoelectrical mode of operation. A mathematical formulation for theopen circuit operation is first presented followed by an analysis of theheterodyne case with a bias applied in constant voltage mode. For the firsttime electrothermal (ET) and thermoelectrical (TE) feedback aretreated in the heat balance equation simultaneously. A parallel resistancegeometry consisting of thermoelectric and HTSC material legs has been chosenfor the device. Computations for the ET-TE feedback show that the responsetime improves by three orders of magnitude and the responsivity becomes doublefor the same TE feedback. In the heat balance equation we have included amongthe heat transfer processes the temperature dependence of the thermalconductance at the bolometer-substrate interface for the dynamic state.
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