Header

UZH-Logo

Maintenance Infos

Design of NbN superconducting nanowire single-photon detectors with enhanced infrared detection efficiency


Wang, Q; Renema, J J; Engel, A; de Dood, M J A (2017). Design of NbN superconducting nanowire single-photon detectors with enhanced infrared detection efficiency. Physical Review Applied, 8(3):034004.

Abstract

We optimize the design of NbN nanowire superconducting single-photon detectors using the recently discovered position-dependent detection efficiency in these devices. This optimized design of meandering wire NbN detectors maximizes absorption at positions where photon detection is most efficient by altering the field distribution across the wire. In order to calculate the response of the detectors with different geometries, we use a monotonic local detection efficiency from a nanowire and optical absorption distribution via finite-difference-time-domain simulations. The calculations predict a trade-off between average absorption and absorption at the edge, leading to a predicted optimal wire width close to 100 nm for a 1550-nm wavelength, which drops to a 50-nm wire width for a 600-nm wavelength. The absorption at the edges can be enhanced by depositing a silicon nanowire on top of the superconducting nanowire, which improves both the total absorption efficiency and the internal detection efficiency of meandering wire structures. The proposed structure can be integrated in a relatively simple cavity structure to reach absorption efficiencies of 97% for perpendicular and 85% for parallel polarization.

Abstract

We optimize the design of NbN nanowire superconducting single-photon detectors using the recently discovered position-dependent detection efficiency in these devices. This optimized design of meandering wire NbN detectors maximizes absorption at positions where photon detection is most efficient by altering the field distribution across the wire. In order to calculate the response of the detectors with different geometries, we use a monotonic local detection efficiency from a nanowire and optical absorption distribution via finite-difference-time-domain simulations. The calculations predict a trade-off between average absorption and absorption at the edge, leading to a predicted optimal wire width close to 100 nm for a 1550-nm wavelength, which drops to a 50-nm wire width for a 600-nm wavelength. The absorption at the edges can be enhanced by depositing a silicon nanowire on top of the superconducting nanowire, which improves both the total absorption efficiency and the internal detection efficiency of meandering wire structures. The proposed structure can be integrated in a relatively simple cavity structure to reach absorption efficiencies of 97% for perpendicular and 85% for parallel polarization.

Statistics

Citations

Dimensions.ai Metrics
4 citations in Web of Science®
1 citation in Scopus®
2 citations in Microsoft Academic
Google Scholar™

Altmetrics

Downloads

8 downloads since deposited on 15 Feb 2018
8 downloads since 12 months
Detailed statistics

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:September 2017
Deposited On:15 Feb 2018 14:06
Last Modified:19 Feb 2018 11:07
Publisher:American Physical Society
ISSN:2331-7019
OA Status:Green
Publisher DOI:https://doi.org/10.1103/PhysRevApplied.8.034004

Download

Download PDF  'Design of NbN superconducting nanowire single-photon detectors with enhanced infrared detection efficiency'.
Preview
Content: Accepted Version
Filetype: PDF
Size: 2MB
View at publisher