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Design of polarization-insensitive superconducting single photon detectors with high-index dielectrics
KTH, School of Engineering Sciences (SCI), Applied Physics. KTH, School of Electrical Engineering (EES).ORCID iD: 0000-0002-5726-1063
2017 (English)In: Superconductors Science and Technology, ISSN 0953-2048, E-ISSN 1361-6668, Vol. 30, no 3, 035005Article in journal (Refereed) Published
Abstract [en]

In this paper, the design of superconducting-nanowire single-photon detectors which are insensitive to the polarization of the incident light is investigated. By using high-refractive-index dielectrics, the index mismatch between the nanowire and the surrounding media is reduced. This enhances the absorption of light with electric field vector perpendicular to the nanowire segments, which is generally hindered in these kind of detectors. Building on this principle and focusing on NbTiN nanowire devices, we present several easy-to-realize cavity architectures which allow high absorption efficiency (in excess of 90%) and polarization insensitivity simultaneously. Designs based on ultranarrow nanowires, for which the polarization sensitivity is much more marked, are also presented. Finally, we briefly discuss the specific advantages of this approach in the case of WSi or MoSi nanowires.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2017. Vol. 30, no 3, 035005
Keyword [en]
microcavity, photodetectors, polarization-insensitive detector, single-photon detectors, SNSPD, superconducting-nanowire detectors, Avalanche photodiodes, Electric fields, Light, Microcavities, Nanowires, Photons, Polarization, Refractive index, Polarization insensitivity, Polarization sensitivity, Polarization-insensitive, Superconducting nanowire, Superconducting nanowire single photon detectors, Superconducting single-photon detectors, Particle beams
National Category
Accelerator Physics and Instrumentation
Identifiers
URN: urn:nbn:se:kth:diva-207965DOI: 10.1088/1361-6668/30/3/035005ISI: 000400009600001Scopus ID: 2-s2.0-85014539201OAI: oai:DiVA.org:kth-207965DiVA: diva2:1103809
Note

QC 20170531

Available from: 2017-05-31 Created: 2017-05-31 Last updated: 2017-06-02Bibliographically approved

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Zwiller, Val

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