Submicrometer photoresponse mapping of nanowire superconducting single-photon detectors

Hadfield, R.H. , Dalgarno, P.A., O’Connor, J.A., Ramsay, E., Warburton, R.J., Gansen, E.J., Baek, B., Stevens, M.J., Mirin, R.P. and Nam, S.W. (2007) Submicrometer photoresponse mapping of nanowire superconducting single-photon detectors. Applied Physics Letters, 91(24), p. 241108. (doi:10.1063/1.2824384)

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Abstract

We report on the photoresponse mapping of nanowire superconducting single-photon detectors using a focal spot significantly smaller than the device area (10×10 μm2). Using a confocal microscope configuration and solid immersion lens, we achieve a spot size of 320 nm full width at half maximum onto the device at 470 nm wavelength. We compare the response maps of two devices: The higher detection efficiency device gives a uniform response, whereas the lower detection efficiency device is limited by a single defect or constriction.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Hadfield, Professor Robert
Authors: Hadfield, R.H., Dalgarno, P.A., O’Connor, J.A., Ramsay, E., Warburton, R.J., Gansen, E.J., Baek, B., Stevens, M.J., Mirin, R.P., and Nam, S.W.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Applied Physics Letters
ISSN:0003-6951
Published Online:13 December 2007

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