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Implementation of a Reference Interferometer for Nanodetection
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Nanoengineered diamond waveguide as a robust bright platform for nanomagnetometry using shallow nitrogen vacancy

S Ali Momenzadeh1, Rainer J Stöhr, Felipe Favaro de Oliveira

  • 13. Institute of Physics, Research Center SCoPE and IQST, University of Stuttgart , 70569 Stuttgart, Germany.

Nano Letters
|December 2, 2014
PubMed
Summary

We developed the brightest monolithic diamond nanostructure for quantum technology, enhancing single nitrogen vacancy (NV) centers. This breakthrough boosts quantum sensing sensitivity and preserves NV spin properties for advanced applications.

Keywords:
Shallow nitrogen vacancy centerT2 dephasing timediamond tapered nanopillarlow temperature T1 relaxation timenanofabrication

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Area of Science:

  • Quantum Technology
  • Materials Science
  • Nanophotonics

Background:

  • Photonic structures in diamond are crucial for quantum technology applications.
  • Nitrogen vacancy (NV) centers in diamond are key quantum emitters.
  • Efficient light extraction from NV centers is a significant challenge.

Purpose of the Study:

  • To demonstrate tapered nanowaveguides structured directly onto diamond substrates.
  • To enhance light extraction efficiency from shallow-implanted NV centers.
  • To assess the impact of nanofabrication on NV spin properties.

Main Methods:

  • Simulations and precise experimental control were used to optimize nanowaveguide geometry.
  • Tapered nanowaveguides were fabricated directly onto diamond substrates.
  • Photonic and spin properties of NV centers were characterized before and after fabrication.

Main Results:

  • Achieved a net photon flux up to 1.7 × 10^6 s^-1, the brightest monolithic bulk diamond structure with single NV centers to date.
  • Nanofabrication process showed no negative impact on excited state lifetime and electronic spin dephasing time (T2).
  • Demonstrated potential for a ~5x improvement in nanomagnetometry sensitivity.

Conclusions:

  • The developed nanowaveguide geometry offers high brightness and low background for diamond defect-based applications.
  • Preserved spin quality makes this structure suitable for advanced quantum sensing, including nanomagnetometry.
  • The study also measured temperature dependency of T1 relaxation time, identifying the dominant Orbach process.