Main > Photonics Research >  Volume 7 >  Issue 8 >  Page 847-852 > Article
Photonics Research, Vol. 7, Issue 8, 847-852 (2019)

Design of a low-filling-factor and polarization-sensitive superconducting nanowire single photon detector with high detection efficiency

Dezhi Li1,2, and Rongzhen Jiao1,2,*

Author Affiliations

  • 1School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China
  • 2State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China

Abstract

We designed a low-filling-factor and polarization-sensitive superconducting nanowire single photon detector (SNSPD), which can achieve a high absorption efficiency and counting rate simultaneously. Numerical simulations show that high absorption efficiency can be achieved by low-filling-factor SNSPDs with a silicon slot and silver reflector. The absorptance of the NbN nanowire for a transverse magnetic (TM) wave at the wavelength of 1550 nm can be 84.4% when the filling factor is only 16.5%, and the corresponding polarization extinction ratio (PER) is 562.9; the absorptance of the NbN nanowire for a transverse electric (TE) wave can be 67.0% when the filling factor is only 11.7%, and the PER is 7.4.