Lifetime Reduction and Enhanced Emission of Single Photon Color Centers in Nanodiamond via Surrounding Refractive Index Modification

Khalid, Asma; Chung, Kelvin; Rajasekharan, Ranjith; Lau, D. W. M.; Karle, Timothy J.; Gibson, Brant C.; Tomljenovic‐Hanic, Snjezana

doi:10.1038/srep11179

Cited by 49 publications

(39 citation statements)

References 39 publications

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“…In the second case, they are located in a homogenous and constant refractive index medium (water, n = 1.3 @ 520 nm). The local refractive index is known to affect the fluorescence of NV centers in FNDs …”

Section: Resultsmentioning

confidence: 99%

Not All Fluorescent Nanodiamonds Are Created Equal: A Comparative Study

Reineck

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Havlík

et al. 2019

Part & Part Syst Charact

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Fluorescent nanodiamonds (FNDs) are vital to many emerging nanotechnological applications, from bioimaging and sensing to quantum nanophotonics. Yet, understanding and engineering the properties of fluorescent defects in nanodiamonds remain challenging. The most comprehensive study to date is presented, of the optical and physical properties of five different nanodiamond samples, in which fluorescent nitrogen‐vacancy (NV) centers are created using different fabrication techniques. The FNDs' fluorescence spectra, lifetime, and spin relaxation time (T1) are investigated via single‐particle confocal fluorescence microscopy and in ensemble measurements in solution (T1 excepted). Particle sizes and shapes are determined using scanning electron microscopy and correlated with the optical results. Statistical tests are used to explore correlations between the properties of individual particles and also analyze average results to directly compare different fabrication techniques. Spectral unmixing is used to quantify the relative NV charge‐state (NV− and NV0) contributions to the overall fluorescence. A strong variation is found and quantified in the properties of individual particles within all analyzed samples and significant differences between the different particle types. This study is an important contribution toward understanding the properties of NV centers in nanodiamonds. It motivates new approaches to the improved engineering of NV‐containing nanodiamonds for future applications.

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Section: Resultsmentioning

confidence: 99%

Not All Fluorescent Nanodiamonds Are Created Equal: A Comparative Study

Reineck

Trindade

Havlík

et al. 2019

Part & Part Syst Charact

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“…This demonstrates that multi-phonon relaxation paths play a negligible role in determining the excited state lifetime [25], suggesting a high radiative quantum efficiency. A statistically significant difference in lifetime for waveguide (6.6 ± 0.3 ns) and bulk (6.0 ± 0.1 ns) emitters implies a high sensitivity to the local photonic density of states [26][27][28], providing further evidence of a high radiative quantum efficiency.…”

mentioning

confidence: 96%

Quantum Nonlinear Optics with a Germanium-Vacancy Color Center in a Nanoscale Diamond Waveguide

et al. 2017

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We demonstrate a quantum nanophotonics platform based on germanium-vacancy (GeV) color centers in fiber-coupled diamond nanophotonic waveguides. We show that GeV optical transitions have a high quantum efficiency and are nearly lifetime-broadened in such nanophotonic structures. These properties yield an efficient interface between waveguide photons and a single GeV without the use of a cavity or slow-light waveguide. As a result, a single GeV center reduces waveguide transmission by 18 ± 1% on resonance in a single pass. We use a nanophotonic interferometer to perform homodyne detection of GeV resonance fluorescence. By probing the photon statistics of the output field, we demonstrate that the GeV-waveguide system is nonlinear at the single-photon level.Efficient coupling between single photons and coherent quantum emitters is a central element of quantum nonlinear optical systems and quantum networks [1][2][3]. Several atom-like defects in the solid-state are currently being explored as promising candidates for the realization of such systems [4], including the nitrogen-vacancy (NV) center in diamond, renowned for its long spin coherence at room temperature [5]; and the silicon-vacancy (SiV) center in diamond, which has recently been shown to have strong, coherent optical transitions in nanostructures [6][7][8][9]. The remarkable optical properties of the SiV center arise from its inversion symmetry [10], which results in a vanishing permanent electric dipole moment for SiV orbital states, dramatically reducing their response to charge fluctuations in the local environment.

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“…This has been explored for dipole emission within an NP in a generalised refractive index distribution [57] and experimentally tested with PMMA coatings of a nanodiamond, containing single emitters, on a Si substrate [58]. Furthermore, the removal and redeposition onto a Si substrate compromises the ability to address the same emitters.…”

Section: Optical Characterisation Of Zno Nps Deposited On a Silicon Smentioning

confidence: 99%

Room-temperature single-photon emission from zinc oxide nanoparticle defects and their in vitro photostable intrinsic fluorescence

et al. 2016

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Zinc oxide (ZnO) is a promising semiconductor that is suitable for bioimaging applications due to its intrinsic defect fluorescence. However, ZnO generally suffers from poor photostability. We report room-temperature single-photon emission from optical defects found in ZnO nanoparticles (NPs) formed by ion implantation followed by thermal oxidation in a silica substrate. We conduct a thorough investigation into the photophysics of a particularly bright defect and identify other single emitters within the NPs. Photostability was observed when the NPs were removed from the growth substrate and taken up by skin cells for in vitro imaging.

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Lifetime Reduction and Enhanced Emission of Single Photon Color Centers in Nanodiamond via Surrounding Refractive Index Modification

Cited by 49 publications

References 39 publications

Not All Fluorescent Nanodiamonds Are Created Equal: A Comparative Study

Not All Fluorescent Nanodiamonds Are Created Equal: A Comparative Study

Quantum Nonlinear Optics with a Germanium-Vacancy Color Center in a Nanoscale Diamond Waveguide

Room-temperature single-photon emission from zinc oxide nanoparticle defects and their in vitro photostable intrinsic fluorescence

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