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Applied Physics Letters / Volume 88 / Issue 12 / DEVICE PHYSICS

Appl. Phys. Lett. 88, 123510 (2006); http://dx.doi.org/10.1063/1.2187444 (3 pages)

Resolution limitation due to phonon losses in superconducting tunnel junctions

D. D. E. Martin1, P. Verhoeve1, A. Peacock1, A. G. Kozorezov2, J. K. Wigmore2, H. Rogalla3, and R. Venn4

1Science Payload and Advanced Concepts Office, Science Directorate of the European Space Agency, ESTEC, Keplerlaan 1, 2201 AZ Noordwijk, The Netherlands
2Department of Physics, Lancaster University, Lancaster, LA1 4YW, United Kingdom
3Low Temperature Division, University of Twente, 7500 AE Enschede, The Netherlands
4Cambridge Microfab Ltd., Broadway, Bourn, Cambridge, CB3 7TA, United Kingdom

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(Received 1 August 2005; accepted 20 February 2006; published online 22 March 2006)

We report greatly enhanced energy resolving power of Ta/Al superconducting tunnel junction (STJ) photon detectors. The improvement in resolution has led to the observation of features in the energy dependence of the resolving power, which are not predicted by the currently prevailing formulas. We show that these effects are related to phonon noise generated during energy down-conversion in the superconducting electrodes, and the dependence of phonon energy loss on the distance of a photon absorption site from the escape interface. The predictions of the model agree well with experimental data in the energy range 0.6–6 eV.

© 2006 American Institute of Physics

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KEYWORDS and PACS

Keywords

phonons, superconductive tunnelling, tantalum, aluminium, superconducting photodetectors, type I superconductors

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2187444

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    P. Verhoeve, R. den Hartog, A. Kozorezov, D. Martin, A. van Dordrecht, J. K. Wigmore, and A. Peacock, J. Appl. Phys. 92, 6072 (2002)JAPIAU000092000010006072000001.

    D. J. Goldie, P. L. Brink, C. Patel, N. E. Booth, and G. L. Salmon, Appl. Phys. Lett. 64, 3169 (1994)APPLAB000064000023003169000001.

    L. J. Hiller, M. L. van den Berg, and S. E. Labov, Appl. Phys. Lett. 79, 4441 (2001)APPLAB000079000026004441000001.

    A. G. Kozorezov, A. F. Volkov, J. K. Wigmore, A. Peacock, A. Poelaert, and R. den Hartog, Phys. Rev. B 61, 11807 (2000).


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