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Proceedings Paper

Novel high-Tc nonbolometric superconducting detectors
Author(s): Anatoly Frenkel
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Paper Abstract

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.

Paper Details

Date Published: 20 May 1994
PDF: 6 pages
Proc. SPIE 2159, High-Temperature Superconducting Detectors: Bolometric and Nonbolometric, (20 May 1994); doi: 10.1117/12.176145
Show Author Affiliations
Anatoly Frenkel, National Institute of Standards and Technology (United States)

Published in SPIE Proceedings Vol. 2159:
High-Temperature Superconducting Detectors: Bolometric and Nonbolometric
Michael Nahum; Jean-Claude Villegier, Editor(s)

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