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Waveguide-coupled superconducting nanowire single-photon detectors based on femtosecond laser direct writing

Authors :
Lixing You
Xiao-Yun Xu
Zhang Weijun
Hou Xintong
Xian-Min Jin
Guang-Zhao Xu
Hao Li
Xuan-Lun Huang
Zhen Wang
Ruo-Jing Ren
Source :
Optics Express. 29:7746
Publication Year :
2021
Publisher :
Optica Publishing Group, 2021.

Abstract

The implementation of quantum information technologies requires the development of integrated quantum chips. Femtosecond laser direct writing (FLDW) waveguides and superconducting nanowire single-photon detectors (SNSPDs) have been widely applied in integrated quantum photonic circuits. In this work, a novel FLDW waveguide-coupled SNSPD was designed and realized by integrating FLDW waveguides and conventional SNSPDs together. Through a COMSOL simulation, a waveguide end face-nanowire optical coupling structure was designed and verified. The simulation results showed that the FLDW waveguide-coupled SNSPD device, which had a target wavelength of 780 nm, can achieve 87% optical absorption. Then the preparation process of the FLDW waveguide-coupled SNSPD device was developed, and the fabricated device achieved a system detection efficiency of 1.7% at 10 Hz dark count rate. Overall, this method provides a feasible single-photon detector solution for future on-chip integrated quantum photonic experiments and applications.

Details

ISSN :
10944087
Volume :
29
Database :
OpenAIRE
Journal :
Optics Express
Accession number :
edsair.doi.dedup.....906d2bbbf7da418b7e9c844e3eaca4cc