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Sensors 2015, 15(2), 3513-3539; doi:10.3390/s150203513

Plasmonic Structure Integrated Single-Photon Detector Configurations to Improve Absorptance and Polarization Contrast

1
Department of Optics and Quantum Electronics, University of Szeged, H-6720 Szeged, Dóm tér 9 6720, Hungary
2
MTA-SZTE Photoacustic Research Group, University of Szeged, H-6720 Szeged, Dóm tér 9 6720, Hungary
*
Author to whom correspondence should be addressed.
Received: 6 November 2014 / Revised: 8 December 2014 / Accepted: 20 January 2015 / Published: 3 February 2015
(This article belongs to the Special Issue Frontiers in Infrared Photodetection)
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Abstract

Configurations capable of maximizing both the absorption component of system detection efficiency and the achievable polarization contrast were determined for 1550 nm polarized light illumination of different plasmonic structure integrated superconducting nanowire single-photon detectors (SNSPDs) consisting of p = 264 nm and P = 792 nm periodic niobium nitride (NbN) patterns on silica substrate. Global effective NbN absorptance maxima appear in case of p/s-polarized light illumination in S/P-orientation (γ = 90°/0° azimuthal angle) and the highest polarization contrast is attained in S-orientation of all devices. Common nanophotonical origin of absorptance enhancement is collective resonance on nanocavity gratings with different profiles, which is promoted by coupling between localized modes in quarter-wavelength metal-insulator-metal nanocavities and laterally synchronized Brewster-Zenneck-type surface waves in integrated SNSPDs possessing a three-quarter-wavelength-scaled periodicity. The spectral sensitivity and dispersion characteristics reveal that device design specific optimal configurations exist. View Full-Text
Keywords: photodetectors; sub-wavelength structures; surface plasmon polaritons; surface waves; plasmonics photodetectors; sub-wavelength structures; surface plasmon polaritons; surface waves; plasmonics
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Csete, M.; Szekeres, G.; Szenes, A.; Szalai, A.; Szabó, G. Plasmonic Structure Integrated Single-Photon Detector Configurations to Improve Absorptance and Polarization Contrast. Sensors 2015, 15, 3513-3539.

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