A waveguide-integrated superconducting nanowire single-photon detector with a spot-size converter on a Si photonics platform

We report a high system detection-efficiency superconducting nanowire single-photon detector (SNSPD) with a spot-size converter (SSC) on a Si photonics platform. The NbN-SNSPD is evanescently coupled to the Si waveguide and connected to the optical fibre through the low-loss SSC comprising a Si inve...

Full description

Saved in:
Bibliographic Details
Published in:Superconductor science & technology 2019-03, Vol.32 (3), p.34001
Main Authors: Shibata, Hiroyuki, Hiraki, Tatsurou, Tsuchizawa, Tai, Yamada, Koji, Tokura, Yasuhiro, Matsuo, Sinji
Format: Article
Language:English
Subjects:
Si waveguide
SNSPD
SSPD
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We report a high system detection-efficiency superconducting nanowire single-photon detector (SNSPD) with a spot-size converter (SSC) on a Si photonics platform. The NbN-SNSPD is evanescently coupled to the Si waveguide and connected to the optical fibre through the low-loss SSC comprising a Si inverse taper and large silica-based core. The fabricated SNSPD chip was assembled on a low-loss fibre-coupled module. The fibre coupling loss of the module is remarkably small (1.9 dB/facet). The fabricated SNSPD module shows system detection efficiency of 32% with the dark count rate of 95 Hz and timing jitter of 75 ps. The measured system detection efficiency is over ten times larger than that of previous waveguide-integrated SNSPDs on the Si platform. The noise equivalent power reaches 3.6 × 10−18 W Hz−1/2, and the figure of merit reaches 1.9 × 108.
ISSN:0953-2048
1361-6668
DOI:10.1088/1361-6668/aaf84f