Nano-optical photoresponse mapping of superconducting nanowires with enhanced near infrared absorption

Erotokritou, K., Heath, R. M. , Taylor, G. G., Tian, C., Banerjee, A., Casaburi, A. , Natarajan, C. M., Miki, S., Terai, H. and Hadfield, R. H. (2018) Nano-optical photoresponse mapping of superconducting nanowires with enhanced near infrared absorption. Superconductor Science and Technology, 31(12), 125012. (doi:10.1088/1361-6668/aae4bb)

Erotokritou, K., Heath, R. M. , Taylor, G. G., Tian, C., Banerjee, A., Casaburi, A. , Natarajan, C. M., Miki, S., Terai, H. and Hadfield, R. H. (2018) Nano-optical photoresponse mapping of superconducting nanowires with enhanced near infrared absorption. Superconductor Science and Technology, 31(12), 125012. (doi:10.1088/1361-6668/aae4bb)

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Abstract

Superconducting nanowire single-photon detectors (SNSPDs) play an important role in emerging optical quantum technologies. We report on advanced nanometric characterization of a high efficiency near infrared SNSPD design based on a low roughness Tantalum pentoxide (Ta2O5)/ silicon dioxide (SiO2) distributed Bragg reflector (DBR) cavity structure. We have performed high resolution transmission electron microscopy (TEM) analysis to verify the smoothness of the DBR. Optical reflectance measurements show excellent correspondence with DBR simulations. We have carried out precision nano-optical photoresponse mapping studies at 940 nm wavelength at T = 3.5 K, indicating excellent large area device uniformity (peak efficiency 55 % at 100 Hz dark count rate [DCR]) with a full width half maximum (FWHM) timing jitter of 60 ps. With manual fibre coupling with single mode fibre, we achieve a system detection efficiency (SDE) of 57.5% at 940 nm wavelength (100 Hz DCR) at T = 2.3 K and a low polarization dependence of 1.20 ± 0.03. For coupling with multimode fibre, we achieve SDE of 90% at 940 nm (200 Hz DCR) at T= 2.3 K. These SNSPD devices are promising candidates for use in quantum dot photoluminescence studies and optical quantum technology applications.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Banerjee, Mr Archan and Erotokritou, Mr Kleanthis and Natarajan, Dr Chandra and Taylor, Gregor and Hadfield, Professor Robert and Heath, Mr Robert and Casaburi, Dr Alessandro
Authors: Erotokritou, K., Heath, R. M., Taylor, G. G., Tian, C., Banerjee, A., Casaburi, A., Natarajan, C. M., Miki, S., Terai, H., and Hadfield, R. H.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Superconductor Science and Technology
Publisher:IOP Publishing
ISSN:0953-2048
ISSN (Online):1361-6668
Published Online:27 September 2018
Copyright Holders:Copyright © 2018 IOP Publishing Ltd.
First Published:First published in Superconductor Science and Technology 31(12): 125012
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
645961Integrated Photonic Quantum technologiesRobert HadfieldEngineering and Physical Sciences Research Council (EPSRC)EP/L024020/1ENG - ENGINEERING ELECTRONICS & NANO ENG
673311IRIS - Infrared imaging and sensing: the single photonRobert HadfieldEuropean Research Council (ERC)648604ENG - ENGINEERING ELECTRONICS & NANO ENG