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Ala T Collins - One of the best experts on this subject based on the ideXlab platform.

  • spectroscopic study of cobalt related optical centers in synthetic diamond
    Journal of Applied Physics, 1996
    Co-Authors: Simo C Lawso, Hisao Kanda, Kenji Watanabe, I Kiflawi, Yoichiro Sato, Ala T Collins
    Abstract:

    This article presents evidence that cobalt forms a series of Optically Active Defect centers in diamond grown by high‐temperature, high‐pressure synthesis. Photoluminescence (PL) studies reveal that the newly observed vibronic systems with zero‐phonon energies at 1.989, 2.135, 2.207, 2.277, 2.367, and 2.590 eV appear only in samples grown using a cobalt‐containing solvent–catalyst. Results of an annealing study, carried out in the temperature range 1500 to 1800 °C, establish that many of the new bands appear during the temperature regime of nitrogen aggregation. It is therefore proposed that nitrogen forms complexes with cobalt to produce Optically Active centers, in a manner analogous to that of nickel point Defects in diamond. Detailed radiative decay time measurements and temperature dependence measurements show that all but one of the bands which are here associated with nitrogen–cobalt complexes have long radiative decay times (∼100 μs), and this again is a characteristic of the PL centers arising fr...

  • Spectroscopic study of cobalt‐related optical centers in synthetic diamond
    Journal of Applied Physics, 1996
    Co-Authors: Simon C. Lawson, Hisao Kanda, Kenji Watanabe, I Kiflawi, Yoichiro Sato, Ala T Collins
    Abstract:

    This article presents evidence that cobalt forms a series of Optically Active Defect centers in diamond grown by high‐temperature, high‐pressure synthesis. Photoluminescence (PL) studies reveal that the newly observed vibronic systems with zero‐phonon energies at 1.989, 2.135, 2.207, 2.277, 2.367, and 2.590 eV appear only in samples grown using a cobalt‐containing solvent–catalyst. Results of an annealing study, carried out in the temperature range 1500 to 1800 °C, establish that many of the new bands appear during the temperature regime of nitrogen aggregation. It is therefore proposed that nitrogen forms complexes with cobalt to produce Optically Active centers, in a manner analogous to that of nickel point Defects in diamond. Detailed radiative decay time measurements and temperature dependence measurements show that all but one of the bands which are here associated with nitrogen–cobalt complexes have long radiative decay times (∼100 μs), and this again is a characteristic of the PL centers arising fr...

J P Hadden - One of the best experts on this subject based on the ideXlab platform.

  • Integrated waveguides and deterministically positioned nitrogen vacancy centers in diamond created by femtosecond laser writing.
    Optics Letters, 2018
    Co-Authors: J P Hadden, Vibhav Bharadwaj, Belén Sotillo, Stefano Rampini, Roberto Osellame, Jeremy D. Witmer, Harishankar Jayakumar, Toney Teddy Fernandez, Andrea Chiappini, Cristina Armellini
    Abstract:

    Diamond’s nitrogen vacancy (NV) center is an Optically Active Defect with long spin coherence times, showing great potential for both efficient nanoscale magnetometry and quantum information processing schemes. Recently, both the formation of buried 3D optical waveguides and high-quality single NVs in diamond were demonstrated using the versatile femtosecond laser-writing technique. However, until now, combining these technologies has been an outstanding challenge. In this Letter, we fabricate laser-written photonic waveguides in quantum grade diamond which are aligned to within micron resolution to single laser-written NVs, enabling an integrated platform providing deterministically positioned waveguide-coupled NVs. This fabrication technology opens the way toward on-chip optical routing of single photons between NVs and Optically integrated spin-based sensing.

  • Waveguide-coupled single NV in diamond enabled by femtosecond laser writing
    arXiv: Quantum Physics, 2017
    Co-Authors: J P Hadden, Vibhav Bharadwaj, Belén Sotillo, Stefano Rampini, Roberto Osellame, Jeremy D. Witmer, Harishankar Jayakumar, Toney Teddy Fernandez, Andrea Chiappini, Cristina Armellini
    Abstract:

    Diamond's nitrogen vacancy (NV) center is an Optically Active Defect with long spin coherence times, showing potential for efficient nanoscale magnetometry and entanglement schemes. Recently, both the formation of buried 3D optical waveguides and high quality single NVs in diamond were demonstrated using femtosecond laser-writing. However, until now, combining these technologies has been an outstanding challenge. In this work, we fabricate laser-written photonic circuits in diamond aligned within micron resolution to single laser-written NVs, enabling an integrated platform providing deterministically positioned waveguide-coupled NVs. This fabrication technology opens the way towards on-chip optical routing of single photons between NVs and Optically integrated spin-based magnetometry.

  • strongly enhanced photon collection from diamond Defect centers under microfabricated integrated solid immersion lenses
    Applied Physics Letters, 2010
    Co-Authors: J P Hadden, J P Harrison, A C Stanleyclarke, L Marseglia, Y L D Ho, Brian Patton, Jeremy L Obrien, John Rarity
    Abstract:

    The efficiency of photon collection from Optically Active Defect centers in bulk diamond is greatly reduced by refraction at the diamond-air interface. We report on the fabrication and measurement of a geometrical solution to the problem; integrated solid immersion lenses (SILs) etched directly into the surface of diamond. An increase of a factor of 10 was observed in the saturated count-rate from a single negatively charged nitrogen-vacancy (NV−) within a 5 μm diameter SIL compared with NV−’s under a planar surface in the same crystal. Such a system is potentially scalable and easily adaptable to other Defect centers in bulk diamond.

Simo C Lawso - One of the best experts on this subject based on the ideXlab platform.

  • spectroscopic study of cobalt related optical centers in synthetic diamond
    Journal of Applied Physics, 1996
    Co-Authors: Simo C Lawso, Hisao Kanda, Kenji Watanabe, I Kiflawi, Yoichiro Sato, Ala T Collins
    Abstract:

    This article presents evidence that cobalt forms a series of Optically Active Defect centers in diamond grown by high‐temperature, high‐pressure synthesis. Photoluminescence (PL) studies reveal that the newly observed vibronic systems with zero‐phonon energies at 1.989, 2.135, 2.207, 2.277, 2.367, and 2.590 eV appear only in samples grown using a cobalt‐containing solvent–catalyst. Results of an annealing study, carried out in the temperature range 1500 to 1800 °C, establish that many of the new bands appear during the temperature regime of nitrogen aggregation. It is therefore proposed that nitrogen forms complexes with cobalt to produce Optically Active centers, in a manner analogous to that of nickel point Defects in diamond. Detailed radiative decay time measurements and temperature dependence measurements show that all but one of the bands which are here associated with nitrogen–cobalt complexes have long radiative decay times (∼100 μs), and this again is a characteristic of the PL centers arising fr...

I Kiflawi - One of the best experts on this subject based on the ideXlab platform.

  • spectroscopic study of cobalt related optical centers in synthetic diamond
    Journal of Applied Physics, 1996
    Co-Authors: Simo C Lawso, Hisao Kanda, Kenji Watanabe, I Kiflawi, Yoichiro Sato, Ala T Collins
    Abstract:

    This article presents evidence that cobalt forms a series of Optically Active Defect centers in diamond grown by high‐temperature, high‐pressure synthesis. Photoluminescence (PL) studies reveal that the newly observed vibronic systems with zero‐phonon energies at 1.989, 2.135, 2.207, 2.277, 2.367, and 2.590 eV appear only in samples grown using a cobalt‐containing solvent–catalyst. Results of an annealing study, carried out in the temperature range 1500 to 1800 °C, establish that many of the new bands appear during the temperature regime of nitrogen aggregation. It is therefore proposed that nitrogen forms complexes with cobalt to produce Optically Active centers, in a manner analogous to that of nickel point Defects in diamond. Detailed radiative decay time measurements and temperature dependence measurements show that all but one of the bands which are here associated with nitrogen–cobalt complexes have long radiative decay times (∼100 μs), and this again is a characteristic of the PL centers arising fr...

  • Spectroscopic study of cobalt‐related optical centers in synthetic diamond
    Journal of Applied Physics, 1996
    Co-Authors: Simon C. Lawson, Hisao Kanda, Kenji Watanabe, I Kiflawi, Yoichiro Sato, Ala T Collins
    Abstract:

    This article presents evidence that cobalt forms a series of Optically Active Defect centers in diamond grown by high‐temperature, high‐pressure synthesis. Photoluminescence (PL) studies reveal that the newly observed vibronic systems with zero‐phonon energies at 1.989, 2.135, 2.207, 2.277, 2.367, and 2.590 eV appear only in samples grown using a cobalt‐containing solvent–catalyst. Results of an annealing study, carried out in the temperature range 1500 to 1800 °C, establish that many of the new bands appear during the temperature regime of nitrogen aggregation. It is therefore proposed that nitrogen forms complexes with cobalt to produce Optically Active centers, in a manner analogous to that of nickel point Defects in diamond. Detailed radiative decay time measurements and temperature dependence measurements show that all but one of the bands which are here associated with nitrogen–cobalt complexes have long radiative decay times (∼100 μs), and this again is a characteristic of the PL centers arising fr...

Kenji Watanabe - One of the best experts on this subject based on the ideXlab platform.

  • spectroscopic study of cobalt related optical centers in synthetic diamond
    Journal of Applied Physics, 1996
    Co-Authors: Simo C Lawso, Hisao Kanda, Kenji Watanabe, I Kiflawi, Yoichiro Sato, Ala T Collins
    Abstract:

    This article presents evidence that cobalt forms a series of Optically Active Defect centers in diamond grown by high‐temperature, high‐pressure synthesis. Photoluminescence (PL) studies reveal that the newly observed vibronic systems with zero‐phonon energies at 1.989, 2.135, 2.207, 2.277, 2.367, and 2.590 eV appear only in samples grown using a cobalt‐containing solvent–catalyst. Results of an annealing study, carried out in the temperature range 1500 to 1800 °C, establish that many of the new bands appear during the temperature regime of nitrogen aggregation. It is therefore proposed that nitrogen forms complexes with cobalt to produce Optically Active centers, in a manner analogous to that of nickel point Defects in diamond. Detailed radiative decay time measurements and temperature dependence measurements show that all but one of the bands which are here associated with nitrogen–cobalt complexes have long radiative decay times (∼100 μs), and this again is a characteristic of the PL centers arising fr...

  • Spectroscopic study of cobalt‐related optical centers in synthetic diamond
    Journal of Applied Physics, 1996
    Co-Authors: Simon C. Lawson, Hisao Kanda, Kenji Watanabe, I Kiflawi, Yoichiro Sato, Ala T Collins
    Abstract:

    This article presents evidence that cobalt forms a series of Optically Active Defect centers in diamond grown by high‐temperature, high‐pressure synthesis. Photoluminescence (PL) studies reveal that the newly observed vibronic systems with zero‐phonon energies at 1.989, 2.135, 2.207, 2.277, 2.367, and 2.590 eV appear only in samples grown using a cobalt‐containing solvent–catalyst. Results of an annealing study, carried out in the temperature range 1500 to 1800 °C, establish that many of the new bands appear during the temperature regime of nitrogen aggregation. It is therefore proposed that nitrogen forms complexes with cobalt to produce Optically Active centers, in a manner analogous to that of nickel point Defects in diamond. Detailed radiative decay time measurements and temperature dependence measurements show that all but one of the bands which are here associated with nitrogen–cobalt complexes have long radiative decay times (∼100 μs), and this again is a characteristic of the PL centers arising fr...