Abstract
The superconducting nanowire single-photon detector (SNSPD) is inherently sensitive to polarization due to its anisotropic nanowire structure. We studied the polarization sensitivity of SNSPDs with ultranarrow nanowires (20–40 nm wide) by simulation and fabricated SNSPDs with 30-nm-wide nanowires. The SNSPD has a maximum system detection efficiency of 20% and a polarization extinction ratio (PER) of 18. The deviation of the PER between the experiment and the simulation can be explained by a trapezoidal cross section of the nanowire.
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