NV center emission in a substrate free low index environment

Inam, FA; Grogan, MDW; Rollings, M; Gaebel, T; Castelletto, S; Say, JM; Bradac, C; Birks, TA; Wadsworth, WJ; Rabeau, JR; Steel, MJ

NV center emission in a substrate free low index environment

Inam, FA Grogan, MDW Rollings, M Gaebel, T Castelletto, S Say, JM Bradac, C

Birks, TA Wadsworth, WJ Rabeau, JR Steel, MJ

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Publication Type:: Conference Proceeding
Citation:: Proceedings of SPIE - The International Society for Optical Engineering, 2013, 8635
Issue Date:: 2013-06-03

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Field	Value	Language
dc.contributor.author	Inam, FA	en_US
dc.contributor.author	Grogan, MDW	en_US
dc.contributor.author	Rollings, M	en_US
dc.contributor.author	Gaebel, T	en_US
dc.contributor.author	Castelletto, S	en_US
dc.contributor.author	Say, JM	en_US
dc.contributor.author	Bradac, C https://orcid.org/0000-0002-6673-7238	en_US
dc.contributor.author	Birks, TA	en_US
dc.contributor.author	Wadsworth, WJ	en_US
dc.contributor.author	Rabeau, JR	en_US
dc.contributor.author	Steel, MJ	en_US
dc.date.issued	2013-06-03	en_US
dc.identifier.citation	Proceedings of SPIE - The International Society for Optical Engineering, 2013, 8635	en_US
dc.identifier.isbn	9780819494047	en_US
dc.identifier.issn	0277-786X	en_US
dc.identifier.uri	http://hdl.handle.net/10453/121016
dc.description.abstract	With in-built advantages (high quantum efficiency and room temperature photostability1) for deployment in quantum technologies as a bright on-demand source of single photons, the nitrogen vacancy (NV) center is the most widely studied optical defect in diamond. Despite significant success in controlling its spontaneous emission2, the fundamental understanding of its photo-physics in various environments and host material remains incomplete. Studying NV photoemission from nanodiamonds on a glass substrate, we recently pointed out a disparity between the measured and calculated decay rates (assuming near unity quantum efficiency)3. This indicates the presence of some strong nonradiative influences from factors most likely intrinsic to nanodiamond itself. To obtain a clearer picture of the NV emission, here we remove the substrate contributions to the decay rates by embedding our nanodiamonds inside silica aerogel, a substrate-free environment of effective index n ∼ 1.05. Nanodiamond doped aerogel samples were fabricated using the two-step process4. Time-resolved fluorescence measurement on ∼20 centers for both coverslip and aerogel configurations, showed an increase in the mean lifetime (∼37%) and narrowing of the distribution width (∼40%) in the aerogel environment, which we associate with the absence of a air/cover-glass interface near the radiating dipoles3. Finite difference time domain (FDTD) calculations showed the strong influence of the irregular nanodiamond geometry on the remaining distribution width. Finally a comparison between measurements and calculations provides an estimate of the quantum efficiency of the nanodiamond NV emitters as ∼0.7. This value is apparently consistent with recent reports concerning the oscillation of the NV center between negative and neutral charge states5. © 2013 SPIE.	en_US
dc.relation.ispartof	Proceedings of SPIE - The International Society for Optical Engineering	en_US
dc.relation.isbasedon	10.1117/12.2003493	en_US
dc.title	NV center emission in a substrate free low index environment	en_US
dc.type	Conference Proceeding
utslib.citation.volume	8635	en_US
utslib.for	0205 Optical Physics	en_US
utslib.for	0206 Quantum Physics	en_US
utslib.for	100703 Nanobiotechnology	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
pubs.organisational-group	/University of Technology Sydney/Strength - IBMD - Initiative for Biomedical Devices
utslib.copyright.status	open_access
pubs.publication-status	Published	en_US
pubs.volume	8635	en_US

Abstract:

With in-built advantages (high quantum efficiency and room temperature photostability1) for deployment in quantum technologies as a bright on-demand source of single photons, the nitrogen vacancy (NV) center is the most widely studied optical defect in diamond. Despite significant success in controlling its spontaneous emission2, the fundamental understanding of its photo-physics in various environments and host material remains incomplete. Studying NV photoemission from nanodiamonds on a glass substrate, we recently pointed out a disparity between the measured and calculated decay rates (assuming near unity quantum efficiency)3. This indicates the presence of some strong nonradiative influences from factors most likely intrinsic to nanodiamond itself. To obtain a clearer picture of the NV emission, here we remove the substrate contributions to the decay rates by embedding our nanodiamonds inside silica aerogel, a substrate-free environment of effective index n ∼ 1.05. Nanodiamond doped aerogel samples were fabricated using the two-step process4. Time-resolved fluorescence measurement on ∼20 centers for both coverslip and aerogel configurations, showed an increase in the mean lifetime (∼37%) and narrowing of the distribution width (∼40%) in the aerogel environment, which we associate with the absence of a air/cover-glass interface near the radiating dipoles3. Finite difference time domain (FDTD) calculations showed the strong influence of the irregular nanodiamond geometry on the remaining distribution width. Finally a comparison between measurements and calculations provides an estimate of the quantum efficiency of the nanodiamond NV emitters as ∼0.7. This value is apparently consistent with recent reports concerning the oscillation of the NV center between negative and neutral charge states5. © 2013 SPIE.

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