Helium ion microscope generated nitrogen-vacancy centres in type Ib diamond

McCloskey, David; Fox, Daniel; O'Hara, Neal; Усов, В.; Scanlan, Declan; McEvoy, Niall; Duesberg, Georg S.; Cross, Graham L. W.; Zhang, Hongzhou; Donegan, John F.

doi:10.1063/1.4862331

Cited by 38 publications

(31 citation statements)

References 34 publications

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“…However, stochastic variation gives rise to the existence of a few NDs exhibiting domains with large numbers of spatially and spectrally identical NV centres which do act cooperatively.It should be noted that previous studies reported a decrease in the LT of NVs for centres produced via lowenergy He-ion irradiation, with the decay time decreasing for increasing ion doses. This effect has been attributed to increased damage in the crystal lattice which provides nonradiative decay paths with faster dynamics [15,16]. This is however inconsistent with our observations where we found that higher peak fluorescence correlated to faster decay rates (see Supplementary Information) -the exact opposite of what would be expected if the shortening of the LTs was indeed due to non-radiative, dark pathways.…”

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confidence: 95%

“…V dd (|e σ1 , g σ2 g σ1 , e σ2 |+|g σ1 , e σ2 e σ1 , g σ2 |) (15) where V dd = 3γb 4(nk 0 ∆r) 3 (d 1 ·d 2 − 3(d 1 ·n)(d 2 ·n)). (16) Hered j is the unit vector direction of the dipole j, ∆r = | r 1 − r 2 | is the separation,n = ( r 1 − r 2 )/∆r is the unit vector separation between dipoles, b ≈ 0.03 is the branching ratio to the ZPL [31], n = 2.4 is the index of refraction of the diamond crystal, γ is the optical decay rate which we can take as γ/2π = 5 MHz for the present estimate, and k 0 = 2π/λ 0 is the vacuum wavevector of the optical transition at wavelength λ 0 = 639nm.…”

Section: Theoretical Model and Fittingmentioning

confidence: 99%

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Room-temperature spontaneous superradiance from single diamond nanocrystals

et al. 2017

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Superradiance (SR) is a cooperative phenomenon which occurs when an ensemble of quantum emitters couples collectively to a mode of the electromagnetic field as a single, massive dipole that radiates photons at an enhanced rate. Previous studies on solid-state systems either reported SR from sizeable crystals with at least one spatial dimension much larger than the wavelength of the light and/or only close to liquid-helium temperatures. Here, we report the observation of room-temperature superradiance from single, highly luminescent diamond nanocrystals with spatial dimensions much smaller than the wavelength of light, and each containing a large number (~ 103) of embedded nitrogen-vacancy (NV) centres. The results pave the way towards a systematic study of SR in a well-controlled, solid-state quantum system at room temperature.

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confidence: 95%

Section: Theoretical Model and Fittingmentioning

confidence: 99%

Room-temperature spontaneous superradiance from single diamond nanocrystals

et al. 2017

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“…Top-down approaches involve the creation of colour centres directly in bulk diamond using high-energy ion, neutron, or electron irradiation followed by annealing [23][24][25] . Implanting colour centres with nanoscale precision is a challenge, which can be overcome by using a lithographic mask 26,27 or a direct-write focussed beam 21,28 . Vertical distribution in the substrate is another challenge for direct writing techniques [29][30][31] , especially since the depth of the colour centre below the surface has an impact on the fluorescence and to sense things near the surface the the colour centres have to be proximal to the surface.…”

Section: Introductionmentioning

confidence: 99%

Nanodiamond arrays on glass for quantification and fluorescence characterisation

Heffernan

Greentree

Gibson

2017

Sci Rep

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Quantifying the variation in emission properties of fluorescent nanodiamonds is important for developing their wide-ranging applicability. Directed self-assembly techniques show promise for positioning nanodiamonds precisely enabling such quantification. Here we show an approach for depositing nanodiamonds in pre-determined arrays which are used to gather statistical information about fluorescent lifetimes. The arrays were created via a layer of photoresist patterned with grids of apertures using electron beam lithography and then drop-cast with nanodiamonds. Electron microscopy revealed a 90% average deposition yield across 3,376 populated array sites, with an average of 20 nanodiamonds per site. Confocal microscopy, optimised for nitrogen vacancy fluorescence collection, revealed a broad distribution of fluorescent lifetimes in agreement with literature. This method for statistically quantifying fluorescent nanoparticles provides a step towards fabrication of hybrid photonic devices for applications from quantum cryptography to sensing.

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“…In principle, the HR1 emission lifetime should enable the detection of luminescence from individual defects, while the HR2 center is almost three times weaker in emission due to its relatively long lifetime. Overall, the narrow ZPL emission of HR centers with small phonon coupling and the photo-excitability under a wide spectral range, combined with the large availability of focused He beams for fabrication [16,[25][26][27] represent promising aspects for the application of HR defects in quantum technologies. …”

mentioning

confidence: 99%

Photo-physical properties of He-related color centers in diamond

Prestopino

Marinelli

Verona

et al. 2017

Applied Physics Letters

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Diamond is a promising platform for the development of technological applications in quantum optics and photonics. The quest for color centers with optimal photo-physical properties has led in recent years to the search for novel impurity-related defects in this material. Here, we report on a systematic investigation of the photo-physical properties of two He-related (HR) emission lines at 535 nm and 560 nm created in three different diamond substrates upon implantation with 1.3 MeV He + ions and subsequent annealing. The spectral features of the HR centers were studied in an "optical grade" diamond substrate as a function of several physical parameters, namely the measurement temperature, the excitation wavelength and the intensity of external electric fields. The emission lifetimes of the 535 nm and 560 nm lines were also measured by means of time-gated photoluminescence measurements, yielding characteristic decay times of (29 ± 5) ns and (106 ± 10) ns, respectively. The Stark shifting of the HR centers under the application of an external electrical field was observed in a CVD diamond film equipped with buried graphitic electrodes, suggesting a lack of inversion symmetry in the defects' structure. Furthermore, the photoluminescence mapping under 405 nm excitation of a "detector grade" diamond sample implanted at a 1×10 10 cm -2 He + ion fluence enabled to identify the spectral features of both the HR emission lines from the same localized optical spots. The reported results provide a first insight towards the understanding of the structure of He-related defects in diamond and their possible utilization in practical applications. MAIN TEXTColor centers in diamond are appealing physical systems for application in emerging quantum technologies. In recent years, a growing interest in this research field led to the discovery, investigation and fabrication of several classes of impurity-related defects [1][2][3][4][5][6][7][8].The formation of optically active defects in diamond upon He implantation followed by annealing in vacuum was recently reported [9]. The spectral features of these defects consist of two narrow emission lines at 536 nm and 560.5 nm, and a phonon sideband in the 572-630 nm spectral range. Following their initial observation in cathodoluminescence (CL) [10,11], their optical activity was investigated in both photoluminescence (PL) and electroluminescence (EL) [9,12]. The need of understanding the possible formation of stable optically active centers, whose current (and still tentative) attribution is based on He incorporation in the diamond lattice, motivates a further investigation of their opto-physical properties. More specifically, the centers have so far been attributed to the He-vacancy complex [13], and density functional theory calculations demonstrated that both this structure and the interstitial He defect could result in stable complexes in the diamond lattice [14]. Apart from this limited body of works, a systematic set of experimental results on the characterization of the ...

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Helium ion microscope generated nitrogen-vacancy centres in type Ib diamond

Cited by 38 publications

References 34 publications

Room-temperature spontaneous superradiance from single diamond nanocrystals

Room-temperature spontaneous superradiance from single diamond nanocrystals

Nanodiamond arrays on glass for quantification and fluorescence characterisation

Photo-physical properties of He-related color centers in diamond

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