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|Title:||Preferential coupling of diamond NV centres in step-index fibres|
Shahraam Afshar, V.
|Citation:||Optics Express, 2021; 29(10):14425-14437|
|Publisher:||The Optical Society; OSA Publishing|
|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|
|Appears in Collections:||IPAS publications|
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