Nano-optical studies of superconducting nanowire single-photon detectors

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)


We report on the photoresponse mapping of nanowire superconducting single-photon detectors using a focal spot significantly smaller than the device area (10 mu m x 10 mu m). Using a solid immersion lens we achieve a spot size of 320 nm full-width 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. A second optical setup is used to simultaneously image and measure the photoresponse of the lower detection efficiency device, allowing the constriction location to be pinpointed.

Original languageEnglish
Title of host publicationQuantum Communications Realized II
Subtitle of host publicationProceedings of the SPIE
EditorsY Arakawa, M Sasaki, H Sotobayashi
Place of PublicationBELLINGHAM
Number of pages6
ISBN (Print)978-0-8194-7482-7
Publication statusPublished - 2009
EventConference on Quantum Communications Realized II - San Jose
Duration: 28 Jan 200929 Jan 2009


ConferenceConference on Quantum Communications Realized II
CitySan Jose


  • Nano-optics
  • Single-photon detector
  • Solid immersion lens
  • Superconducting detector


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