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 Hadfield, Professor Robert and Casaburi, Dr Alessandro and Erotokritou, Mr Kleanthis and Natarajan, Dr Chandra and Heath, Mr Robert and Taylor, Gregor |
| 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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