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Configurations capable of maximizing both absorptance and polarizationcontrast were determined for 1550 nm polarized light illumination of differentplasmonic 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 NbN absorptance maxima appear in case ofp/s-polarized light illumination in S/P-orientation (gamma=90 azimuthal angle)and the highest polarization contrast is attained in S-orientation of alldevices. Common nanophotonical origin of absorptance enhancement is collectiveresonance on nano-cavity-gratings with different profiles, which is promoted bycoupling between localized modes in quarter wavelength MIM nano-cavities andlaterally synchronized Brewster-Zenneck-type surface waves in integrated SNSPDspossessing a three-quarter-wavelength-scaled periodicity. The spectralsensitivity and dispersion characteristics reveal that device design specificoptimal configurations exist.

Plasmonic structure integrated single-photon detector configurations to improve absorptance and polarization contrast