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20 May 1994 Novel high-Tc nonbolometric superconducting detectors
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New ultrafast and sensitive superconducting high Tc detectors are proposed. Based on the analysis of the mechanism of the optical response it is suggested that the speed limit of the photoresponse is governed by the phonon escape time. Furthermore, the intrinsic speed limit is determined by the relaxation time of quasiparticles generated by photons through the electron- electron and electron-phonon scattering which is on the order of a picosecond. The device structure is presented for the optimization of the phonon escape time. It is also proposed to increase the detector responsivity by improving the efficiency of the flux activation (unpinning of vortices by the high energy quasiparticles and phonons) and increasing the critical current density which can be accomplished simultaneously by the increasing pinning site (or defect) density. A superconducting ultrafast flux activation detector is proposed with a picosecond time response and significantly improved responsivity.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Anatoly Frenkel "Novel high-Tc nonbolometric superconducting detectors", Proc. SPIE 2159, High-Temperature Superconducting Detectors: Bolometric and Nonbolometric, (20 May 1994);

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