PHOTORESPONSE MECHANISMS OF THIN SUPERCONDUCTING FILMS AND SUPERCONDUCTING DETECTORS

摘要: The photoresponse of ordinary and high-Tc superconductors depends critically on the hierarchy relaxation times, such as electron–phonon phonon–electron scattering time phonon escape from a superconducting film also return time. For thin films cuprates, close to transition following components transient response are identified. picosecond is attributed dynamics nonequilibrium quasiparticles Cooper pairs. nanosecond described by thermal boundary resistance (the Kapitza resistance) between substrate. microsecond associated with diffusion in Using experimental results, we deduce characteristic parameters film-substrate interface. kinetic inductance s- d-wave pairing far below calculated. We study (responsivity, operating speed noise equivalent power) detector, which only electron states changed under radiation, while phonons stay thermodynamic equilibrium Our analysis demonstrates that detectors have essential advantages compared bolometers other detectors.