Modification of spontaneous emission from nanodiamond colour centres on a structured surface

Inam, Faraz A.; Gaebel, T.; Bradac, Carlo; Stewart, Luke A.; Withford, Michael J.; Dawes, Judith M.; Rabeau, James R.; Steel, M. J.

doi:10.1088/1367-2630/13/7/073012

Cited by 56 publications

(89 citation statements)

References 57 publications

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“…The decay constants τ 1 and τ 2 for the two curves were calculated (through least squares curve fitting) and used to approximate the life time τ 1 and τ 2 of the center before and after silk coating respectively [24]. Since the emission rate Γ is inversely proportional to the lifetime i.e., Γα 1/τ [27], hence τ 2~ (1/2 × τ 1 ) for the center showing a 2.2 times emission enhancement. The approximately calculated life time for the center after coating τ 2 ≈4.2 ns is nearly half of the approximated life time before coating τ 1 ≈10.0 ns, which can also be observed through the difference in the g (2) (t) fit of Fig.…”

Section: Emission Measurementsmentioning

confidence: 99%

“…The NV -is trapped inside the diamond nanoparticle with a high refractive index (n d = 2.4 at λ = 637 nm) and in close proximity to the ND/Si interface i.e., z 0 = λ. The power radiated is significantly different from that radiated in free space or air when such a dipole is captured inside a spherical particle, close to a planar surface [27][28][29][30][31]. Here z 0 is the dipole's distance from the ND/Si interface and the dipole is assumed to be located in the center of the ND.…”

Section: Emission Measurementsmentioning

confidence: 99%

“…The evanescent waves provide an additional channel for the dipole to radiate its power into and their contribution causes a significant rise of power for small values of z 0 . In addition, the effect of encapsulation of the dipole inside ND also plays its part in the determination of the total power radiated [27,29] and is mainly dependent on the refractive index ratio n d /n 1 [29].…”

Section: Emission Measurementsmentioning

confidence: 99%

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Synthesis and characterization of biocompatible nanodiamond-silk hybrid material

Khalid¹,

Lodin²,

Domachuk³

et al. 2014

Biomed. Opt. Express

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Abstract:A new hybrid material consisting of nanodiamonds (NDs) and silk has been synthesized and investigated. NDs can contain bright fluorescence centers, important for bioprobes to image biological structures at the nanoscale and silk provides a transparent, robust matrix for these nanoparticles in-vivo or in-vitro. The ND-silk hybrid films were determined to be highly transparent in the visible to near infrared wavelength range. The NDs embedded in silk exhibited significant enhancement of emission relative to air, correlating with theoretical predictions. Furthermore, animal toxicity tests confirmed ND-silk films to be non-toxic in an in-vivo mice model. ©201 Optical Society of America

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Section: Emission Measurementsmentioning

confidence: 99%

Section: Emission Measurementsmentioning

confidence: 99%

Section: Emission Measurementsmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis and characterization of biocompatible nanodiamond-silk hybrid material

Khalid¹,

Lodin²,

Domachuk³

et al. 2014

Biomed. Opt. Express

View full text Add to dashboard Cite

show abstract

“…This spread of lifetimes can be attributed to several effects. For example, variations of local density of states experienced by different NVEs [52,53] due to variations in nanocrystal sizes and shapes as well as varying direct nonradiative decay rates [54] can affect the observed ensemble lifetimes.…”

mentioning

confidence: 99%

Electron spin contrast of Purcell-enhanced nitrogen-vacancy ensembles in nanodiamonds

et al. 2017

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Nitrogen-vacancy centers in diamond allow for coherent spin state manipulation at room temperature, which could bring dramatic advances to nanoscale sensing and quantum information technology. We introduce a novel method for the optical measurement of the spin contrast in dense nitrogen-vacancy (NV) ensembles. This method brings a new insight into the interplay between the spin contrast and fluorescence lifetime. We show that for improving the spin readout sensitivity in NV ensembles, one should aim at modifying the far field radiation pattern rather than enhancing the emission rate.Nitrogen-vacancy color centers (NV) in diamond are fluorescent lattice defects resulting from a vacancy and an adjacent nitrogen substitution [1,2]. These color centers have proven to be excellent testbeds for novel nanoscale optical devices.Ultrasensitive electromagnetic field [3][4][5][6][7][8], strain [9,10], pressure [11], and temperature [12,13] sensors as well as integrated quantum information processors [14][15][16] operating at ambient conditions have been prototyped using NVs. These capabilities are in large part due to the unique properties of the NV's electron spin, which may be optically initialized and manipulated by microwave signals [17,18]. The NV exhibits a spin-dependent fluorescence rate, which can be used for optical spin state readout [19]. We have calibrated the laser power using saturation measurements to ensure that both nanodiamonds on sapphire and TiN experience a similar optical excitation rate opt 1.5 MHz k [51]. For larger pump powers, we found that the contrast 1 T C drops and almost completely vanishes in strong saturation [51]. The origin of this effect, which is still under investigation, can be attributed to the charge exchange processes involving proximal NV centers and/or nitrogen impurities. Such dynamics may be especially pronounced in dense ensembles like ours, e.g. due to Auger-type effects. This effect makes it impractical to work in the saturation regime and limits the observable spin contrast values.Before rigorously investigating the observed dependence of spin contrast on fluorescence lifetime, we present a qualitative explanation, based on the NV level structure (Figure 4(a)). For simplicity, in this discussion we assume that the optical excitation rate is much lower than all the level decay rates. Following the absorption of a photon, both the excited state (ES) and the singlet levels relax into the ground state (GS) levels before the next photon is absorbed. The excited states (ES) of the s 0 m  and s 1 m  subsystems (i.e. levels 0e and 1e respectively) have equal radiative decay rates ( rad k ) into their respective ground states (GS) 0g and 1g . However, the fluorescence rate of the s 0 m  subsystem is higher, because the non-radiative decay of 0e through the singlet state s is less probable than that of 1e ( Here,is the rate of spin-conserving direct ES decay, opt k is the optical pumping rate, () cross i k are the intersystem crossing rates from 0e and 1e to the singlet state...

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“…Since the immediate dielectric environment of the nanodiamonds was not modified, 23,24 we assume that the radiative decay remains the same for the coated and the pristine nanodiamonds.…”

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confidence: 99%

Enhanced photoluminescence from single nitrogen-vacancy defects in nanodiamonds coated with phenol-ionic complexes

et al. 2015

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Fluorescent nanodiamonds are attracting major attention in the field of bio-sensing and biolabeling. In this work we demonstrate a robust approach to surface functionalize individual nanodiamonds with metal-phenolic networks that enhance the photoluminescence from single nitrogen vacancy (NV) centers. We show that single NV centres in the coated nanodiamonds also exhibit shorter lifetimes, opening another channel for high resolution sensing. We propose that the nanodiamond encapsulation suppresses the non-radiative decay pathways of the NV color centers. Our results provide a versatile and assessable way to enhance photoluminescence from nanodiamond defects that can be used in a variety of sensing and imaging applications.

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Modification of spontaneous emission from nanodiamond colour centres on a structured surface

Cited by 56 publications

References 57 publications

Synthesis and characterization of biocompatible nanodiamond-silk hybrid material

Synthesis and characterization of biocompatible nanodiamond-silk hybrid material

Electron spin contrast of Purcell-enhanced nitrogen-vacancy ensembles in nanodiamonds

Enhanced photoluminescence from single nitrogen-vacancy defects in nanodiamonds coated with phenol-ionic complexes

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