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Design of broadband high-efficiency superconducting-nanowire single photon detectors
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2016 (English)In: Superconductors Science and Technology, ISSN 0953-2048, E-ISSN 1361-6668, Vol. 29, no 6, 065016Article in journal (Refereed) PublishedText
Abstract [en]

In this paper several designs to maximize the absorption efficiency of superconducting-nanowire single-photon detectors are investigated. Using a simple optical cavity consisting of a gold mirror and a SiO2 layer, the absorption efficiency can be boosted to over 97%: this result is confirmed experimentally by the realization of an NbTiN-based detector having an overall system detection efficiency of 85% at 1.31 mu m. Calculations show that by sandwiching the nanowire between two dielectric Bragg reflectors, unity absorption (>99.9%) could be reached at the peak wavelength for optimized structures. To achieve broadband high efficiency, a different approach is considered: a waveguide-coupled detector. The calculations performed in this work show that, by correctly dimensioning the waveguide and the nanowire, polarization-insensitive detectors absorbing more than 95% of the injected photons over a wavelength range of several hundred nm can be designed. We propose a detector design making use of GaN/AlN waveguides, since these materials allow lattice-matched epitaxial deposition of Nb(Ti)N films and are transparent on a very wide wavelength range.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2016. Vol. 29, no 6, 065016
Keyword [en]
photodetectors, single-photon detectors, superconducting-nanowire detectors, waveguide, microcavity, SNSPD, nitride
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URN: urn:nbn:se:kth:diva-188435DOI: 10.1088/0953-2048/29/6/065016ISI: 000376268900025ScopusID: 2-s2.0-84969808386OAI: diva2:936707

QC 20160614

Available from: 2016-06-14 Created: 2016-06-10 Last updated: 2016-06-14Bibliographically approved

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Zwiller, Vall
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Applied Physics
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