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Type: Journal article
Title: Preferential coupling of diamond NV centres in step-index fibres
Author: Li, S.
Bai, D.
Capelli, M.
Sun, Q.
Shahraam Afshar, V.
Simpson, D.A.
Foster, S.
Ebendorff-Heidepriem, H.
Gibson, B.C.
Greentree, A.D.
Citation: Optics Express, 2021; 29(10):14425-14437
Publisher: The Optical Society; OSA Publishing
Issue Date: 2021
ISSN: 1094-4087
Statement of
Shuo Li, Dongbi Bai, Marco Capelli, Qiang Sun, Shahraam Afshar V., David A. Simpson, Scott Foster, Heike Ebendorff-Heidepriem, Brant C. Gibson, And Andrew D. Greentree
Abstract: Diamonds containing the negatively charged nitrogen-vacancy centre are a promising system for room-temperature magnetometry. The combination of nano- and micro-diamond particles with optical fibres provides an option for deploying nitrogen-vacancy magnetometers in harsh and challenging environments. Here we numerically explore the coupling efficiency from nitrogen-vacancy centres within a diamond doped at the core/clad interface across a range of commercially available fibre types so as to inform the design process for a diamond in fibre magnetometers. We determine coupling efficiencies from nitrogen-vacancy centres to the guided modes of a step-index fibre and predict the optically detected magnetic resonance (ODMR) generated by a ensemble of four nitrogen-vacancy centres in this hybrid fibre system. Our results show that the coupling efficiency is enhanced with a high refractive index difference between the fibre core and cladding and depends on the radial position of the nitrogen-vacancy centres in the fibre core. Our ODMR simulations show that due to the preferential coupling of the nitrogen-vacancy emission to the fibre guided modes, certain magnetometry features such as ODMR contrast can be enhanced and lead to improved sensitivity in such diamond-fibre systems, relative to conventional diamond only ensemble geometries.
Rights: © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
DOI: 10.1364/OE.417825
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