Responsivity calculation and measurement of YBaCuO optical detector

The optical response of granular YBa/sub 2/Cu/sub 3/O/sub 7- delta / films using microbridge structure was investigated. Considering the self-heating effect of the detector from the bias current, a bolometric model was proposed to calculate the temperature rise and responsivity of the bolometer. The responsivity of a nonequilibrium detector on the basis of grain boundary Josephson junctions in granular films has also been demonstrated. Optical detectors with responsivities of more than 10/sup 3/ v/w at liquid nitrogen temperature have been fabricated. Experimental evidence for the coexistence of bolometric and nonbolometric effect is given. Calculations based on the proposed model are in agreement with the experimental results.>