Inductive superconducting transition-edge detector for single-photon and macro-molecule detection

Hao, L., Gallop, J.C., Gardiner, C. , Josephs-Franks, P., Macfarlane, J.C., Lam, S.K.H. and Foley, C. (2003) Inductive superconducting transition-edge detector for single-photon and macro-molecule detection. Superconductor Science and Technology, 16(12), pp. 1479-1482. (doi:10.1088/0953-2048/16/12/035)

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Abstract

We present a new type of transition-edge sensor for single-photon and macro-molecule detection. In our detector the absorber element is an isolated, passive absorber of extremely low thermal mass, maintained close to, but below, its superconducting–normal transition, and strongly inductively coupled to a SQUID sensor. Incoming particles or photons are sensed in terms of a transient change in the inductive coupling, rather than a change in resistance. The detector's energy sensitivity and response time can be defined by the thermal mass of the absorber and its thermal contact with a substrate, independently of any electrical connections. We have modelled the energy sensitivity of our inductive superconducting transition-edge sensor using a sub-micron SQUID as an inductive read-out device. An ultimate energy resolution of order 10−25 J Hz−1 is theoretically estimated based on the properties of the read-out SQUID and the dimensions of the absorber. We also report our initial work on fabrication of the Nb nanoscale SQUID where we have used the same material deposited on top of the SQUID as a thin-film absorber.

Item Type:Articles
Keywords:Single photon detection, superconducting transition edge detector.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Webster, Dr Carol
Authors: Hao, L., Gallop, J.C., Gardiner, C., Josephs-Franks, P., Macfarlane, J.C., Lam, S.K.H., and Foley, C.
College/School:College of Science and Engineering > School of Computing Science
Journal Name:Superconductor Science and Technology
Journal Abbr.:Supercond Sci Technol
Publisher:IOP Publishing
ISSN:0953-2048
ISSN (Online):1361-6668
Published Online:07 November 2003

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