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Enhanced telecom wavelength single-photon detection with NbTiN superconducting nanowires on oxidized silicon

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13 Author(s)
Tanner, M.G. ; Scottish Universities Physics Alliance and School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom ; Natarajan, C.M. ; Pottapenjara, V.K. ; OConnor, J.A.
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Superconducting nanowire single-photon detectors (SNSPDs) have emerged as a highly promising infrared single-photon detector technology. Next-generation devices are being developed with enhanced detection efficiency (DE) at key technological wavelengths via the use of optical cavities. Furthermore, new materials and substrates are being explored for improved fabrication versatility, higher DE, and lower dark counts. We report on the practical performance of packaged NbTiN SNSPDs fabricated on oxidized silicon substrates in the wavelength range from 830 to 1700 nm. We exploit constructive interference from the SiO2/Si interface in order to achieve enhanced front-side fiber-coupled DE of 23.2 % at 1310 nm, at 1 kHz dark count rate, with 60 ps full width half maximum timing jitter.

Published in:

Applied Physics Letters  (Volume:96 ,  Issue: 22 )

Date of Publication:

May 2010

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