• A
  • A
  • A
  • ABC
  • ABC
  • ABC
  • А
  • А
  • А
  • А
  • А
Regular version of the site

Article

Ultrafast superconducting single-photon detector with a reduced active area coupled to a tapered lensed single-mode fiber

Journal of Nanophotonics. 2015. Vol. 9. P. 093051-1-093051-7.
Sidorova M., Divochiy A., Vakhomin Y., Smirnov K.

This paper presents an ultrafast niobium nitride (NbN) superconducting single-photon detector (SSPD) with an active area of 3 × 3 μm^2 that offers better timing performance metrics than the previous SSPD with an active area of 7 × 7 μm^2. The improved SSPD demonstrates a record timing jitter (<25 ps), an ultrashort recovery time (<2 ns), an extremely low dark count rate, and a high detection efficiency in a wide spectral range from visible part to near infrared. The record parameters were obtained due to the development of a new technique providing effective optical coupling between a detector with a reduced active area and a standard singlemode telecommunication fiber. The advantages of the new approach are experimentally confirmed by taking electro-optical measurements.