Submicrometer photoresponse mapping of nanowire superconducting single-photon detectors

Robert H. Hadfield, Paul A. Dalgarno, John A. O'Connor, Euan Ramsay, Richard J. Warburton, Eric J. Gansen, Burm Baek, Martin J. Stevens, Richard P. Mirin, Sae Woo Nam

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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 µ m2). 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. © 2007 American Institute of Physics.

Original languageEnglish
Article number241108
JournalApplied Physics Letters
Volume91
Issue number24
DOIs
Publication statusPublished - 2007

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    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., & Nam, S. W. (2007). Submicrometer photoresponse mapping of nanowire superconducting single-photon detectors. Applied Physics Letters, 91(24), [241108]. https://doi.org/10.1063/1.2824384