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Polarization-insensitive fiber-coupled superconducting-nanowire single photon detector using high-index dielectric capping layer
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2018 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 26, no 13Article in journal (Refereed) Published
Abstract [en]

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 μm, in excellent agreement with simulations.

Place, publisher, year, edition, pages
2018. Vol. 26, no 13
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-251755DOI: 10.1364/OE.26.017697ISI: 000436226800140PubMedID: 30119580Scopus ID: 2-s2.0-85048975081OAI: oai:DiVA.org:kth-251755DiVA, id: diva2:1316882
Note

QC 20190802

Available from: 2019-05-21 Created: 2019-05-21 Last updated: 2020-03-09Bibliographically approved

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Publisher's full textPubMedScopushttps://www.qnp.aphys.kth.se/polopoly_fs/1.833933.1550154651!/oe-26-13-17697.pdf

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Zwiller, Val

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