4.6 Article

Polarization-insensitive fiber-coupled superconducting-nanowire single photon detector using a high-index dielectric capping layer

Journal

OPTICS EXPRESS
Volume 26, Issue 13, Pages 17697-17704

Publisher

OPTICAL SOC AMER
DOI: 10.1364/OE.26.017697

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Funding

  1. European Commission via the Marie Sklodowska Curie IF grant SuSiPOD (H2020-MSCA-IF-2015) [657497]
  2. French National Research Agency via the WASI program [ANR-14-CE26-0007]
  3. Grenoble Nanoscience Foundation via the NAQUOP project

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Superconducting-nanowire single photon detectors (SNSPDs) are able to reach near-unity detection efficiency in the infrared spectral range. However, due to the intrinsic asymmetry of nanowires, SNSPDs are usually very sensitive to the polarization of the incident radiation, their responsivity being maximum for light polarized parallel to the nanowire length (transverse-electric (TE) polarization). Here, we report on the reduction of the polarization sensitivity obtained by capping NbN-based SNSPDs with a high-index SiNx dielectric layer, which reduces the permittivity mismatch between the NbN wire and the surrounding area. Experimentally, a polarization sensitivity below 0.1 is obtained both at 1.31 and 1.55 mu m, in excellent agreement with simulations. (C) 2018 Optical Society of America under the terms of the OS.A Open Access Publishing Agreement

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