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Proceedings Paper

Nano-optical studies of superconducting nanowire single-photon detectors
Author(s): 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
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Paper Abstract

We report on the photoresponse mapping of nanowire superconducting single-photon detectors using a focal spot significantly smaller than the device area (10 μm x 10 μm). 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.

Paper Details

Date Published: 26 January 2009
PDF: 6 pages
Proc. SPIE 7236, Quantum Communications Realized II, 72360G (26 January 2009); doi: 10.1117/12.819360
Show Author Affiliations
Robert H. Hadfield, Heriot-Watt Univ. (United Kingdom)
Paul A. Dalgarno, Heriot-Watt Univ. (United Kingdom)
John A. O'Connor, Heriot-Watt Univ. (United Kingdom)
Euan J. Ramsay, Heriot-Watt Univ. (United Kingdom)
Richard J. Warburton, Heriot-Watt Univ. (United Kingdom)
Eric J. Gansen, University of Wisconsin-La Crosse (United States)
Burm Baek, National Insitute of Standards and Technology (United States)
Martin J. Stevens, National Insitute of Standards and Technology (United States)
Richard P. Mirin, National Insitute of Standards and Technology (United States)
Sae Woo Nam, National Insitute of Standards and Technology (United States)

Published in SPIE Proceedings Vol. 7236:
Quantum Communications Realized II
Yasuhiko Arakawa; Masahide Sasaki; Hideyuki Sotobayashi, Editor(s)

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