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Low temperature investigations and surface treatments of colloidal narrowband fluorescent nanodiamonds
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10.1063/1.4807398
/content/aip/journal/jap/113/20/10.1063/1.4807398
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/20/10.1063/1.4807398
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Figures

Image of FIG. 1.
FIG. 1.

(a) Raman spectra of an ensemble of BASD NDs after different treatments: curve 2 without treatment, curve 3 hydrogen treated, curve 4 oxygen 460 °C, curve 5 oxygen 480 °C. For comparison, the Raman spectrum of a high pressure high temperature single crystalline diamond is given (curve 1). The spectra have been recorded using 488 nm laser light, corrected for a linearly rising fluorescence background and shifted vertically for clarity. (b) Detailed spectrum of the diamond Raman line with Lorentzian fit. Note that the calibration of the Raman Spectrometer has been done on the Raman line of a HPHT single crystal diamond set to 1332.5 cm.

Image of FIG. 2.
FIG. 2.

(a) Spectrum of SiV ensemble in BASD nanodiamond and changes during oxidation, (b) spectrum of ND with dominant emission from a single SiV center (Fit: dashed line, peak 737.2 nm, width 1.5 nm) with underlying ensemble emission especially visible in the long wavelength edge of the single emitter spectrum.

Image of FIG. 3.
FIG. 3.

(a) Changes in ZPL width , brightness and ZPL peak wavelength λ for NDs containing SiV ensembles. (b) function of a single SiV center with underlying ensemble emission after first oxidation step, (c) function of a single SiV center with underlying ensemble emission after second oxidation step. Gray solid lines represent fits to the data using the function of a three level system convoluted with the instrument response of the measurement setup and corrected for background emission (for details see, e.g., Ref. ). Both measurements have been performed using 20 W of excitation power.

Image of FIG. 4.
FIG. 4.

(a) Temperature dependent spectra of a BASD ND with dominant emission from a single SiV center, excitation 671 nm. Shifted to longer wavelength from the main line of the single SiV center, the underlying ensemble is clearly visible. The inset shows the ZPL fine-structure of an ensemble of SiV centers in a thin high quality homoepitaxial CVD diamond film at 6.4 K for comparison. (b) Homogeneous and inhomogeneous (spectral diffusion) width of the main line of the single SiV center, (c) shift of the main line of the single center.

Image of FIG. 5.
FIG. 5.

Polarized absorption measured on a ND with dominant emission from a single SiV center and underlying ensemble emission (a) fluorescence spectra taken at different angles of incident excitation polarization ( = 15 K, excitation 0.18 mW). Shifted to longer wavelength from the main line of the single SiV center, the underlying ensemble is clearly visible (wavelength range 736-740 nm). (Inset: enlarged detail of single emitter line), (b) summary of visibility and linear polarization direction corresponding to maximum absorption for the single emitter lines.

Image of FIG. 6.
FIG. 6.

Fluorescence polarization measured on a ND with dominant emission from a single SiV center and underlying ensemble emission (a) fluorescence spectra taken at different angles of polarization analyzer ( = 15 K, excitation 0.18 mW). Shifted to longer wavelength from the main line of the single SiV center, the underlying ensemble is clearly visible (wavelength range 736-740 nm). The excitation polarization is fixed to the optimal value. (Inset: enlarged detail of single emitter line), (b) summary of visibility and linear polarization direction for the single emitter lines.

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/content/aip/journal/jap/113/20/10.1063/1.4807398
2013-05-23
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Low temperature investigations and surface treatments of colloidal narrowband fluorescent nanodiamonds
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/20/10.1063/1.4807398
10.1063/1.4807398
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