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

doi:10.1117/12.819360

26 January 2009 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

Author Affiliations +

Proceedings Volume 7236, Quantum Communications Realized II; 72360G (2009) https://doi.org/10.1117/12.819360
Event: SPIE OPTO: Integrated Optoelectronic Devices, 2009, San Jose, California, United States

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.

Citation Download Citation

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, and Sae Woo Nam "Nano-optical studies of superconducting nanowire single-photon detectors", Proc. SPIE 7236, Quantum Communications Realized II, 72360G (26 January 2009); https://doi.org/10.1117/12.819360

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