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Conference on Lasers and Electro-Optics

Exceeding 95% system efficiency within the telecom C-band in superconducting nanowire single photon detectors

Dileep V. Reddy, Robert R. Nerem, Adriana E. Lita, Sae Woo Nam, Richard P. Mirin, Varun Boehm Verma

Published Jan 1, 2019• 15 citations
Publisher

Abstract

We present a single-photon detector with system detection efficiencies exceeding 95% over the wavelength range 1520-1550 nm, with polarization sensitivities in the range of 1.02-1.08. The wavelength range is tunable over 200 nm via variation of the top-two dielectric layer thicknesses.
DOI
10.1364/cleo_qels.2019.ff1a.3

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Superconducting nanowire single-photon detectors(SSPDs or SNSPDs) can detect single photons in a wide spectrum range from ultraviolet to mid-infrared wavelengths. We developed SSPDs for the light wavelength of 900-1100 nm, where it is difficult to achieve high detection efficiency by either Si or InGaAs avalanche photodiodes. We designed and fabricated the SSPD with non-periodic dielectric multilayers (DMLs) composed of SiO2 and TiO2 to enhance the optical absorptance in the wavelength range of 900-1100 nm. We measured the detection efficiency (DE) in the wavelength range of 800-1360 nm using a supercontinuum light source and found that the wavelength dependence of DE was in good agreement with the simulated spectrum of the optical absorptance of the nanowire device on the designed DML. The highest system DE was 81.0% for the wavelength of 980 nm.