The contribution of bends and constrictions of a superconducting film to the photon detection by a single-photon superconducting detector

Abstract

The contribution of bends and constrictions by a superconducting film to the detection by a singlephoton superconducting detector is investigated. It has been shown that, for currents smaller than the minimal detection current of a straight film, the detection efficiency of a film with a constriction attains saturation upon an increase in the current, which coincides qualitatively with the behavior of this dependence observed in the experiment. It has also been found that the effect of bends in the film and the external magnetic field on the detection efficiency for low-energy photons is essential, while for high-energy photons no such influence is observed.