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In this paper, the design of superconducting-nanowire single-photon detectorswhich are insensitive to the polarization of the incident light isinvestigated. By using high-refractive-index dielectrics, the index mismatchbetween the nanowire and the surrounding media is reduced. This enhances theabsorption of light with electric field vector perpendicular to the nanowiresegments, which is generally hindered in this kind of detectors. Building onthis principle and focusing on NbTiN nanowire devices, we present severaleasy-to-realize cavity architectures which allow high absorption efficiency (inexcess of 90%) and polarization insensitivity simultaneously. Designs based onultranarrow nanowires, for which the polarization sensitivity is much moremarked, are also presented. Finally, we briefly discuss the specific advantagesof this approach in the case of WSi or MoSi nanowires.

Design of polarization-insensitive superconducting single photon detectors with high-index dielectrics