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Design, Construction and Characterization of a Magnetic Imaging Microscope based on Nitrogen Vacancy Centers in Diamond

Akbari, Navid | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57232 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Esfandiar, Ali
  7. Abstract:
  8. In recent years, quantum sensing based on spin defects in solid-state materials, particularly nitrogen vacancy defects in diamond, has been a significant research topic in the field of quantum technologies. Its applications have been demonstrated in various areas such as biology, microelectronics chips, and condensed matter physics. The aim of this research is to construct a magnetic imaging microscope based on an ensemble of diamond crystals using the continuous wave optically detected magnetic resonance method (CW-ODMR). By constructing an epifluorescence microscope and simultaneously exciting the diamond sample with green light and microwave radiation, it is possible to obtain information about the magnetic field near the diamond crystal through wide-field imaging. After the setup construction, the sensing results for single-pixel detection and for different bias field orientations relative to the diamond crystal were obtained. Depending on the different conditions, the sensitivity level was found to be in the range of 200-700 nT/√Hz , and the effect of laser and microwave power on the sensitivity of the setup was investigated. Additionally, the effect of a magnetic flux concentrator on improving sensor sensitivity was examined, and a minimum value of 6 nT/√Hzwas achieved. Finally, the magnetic field image in the direction perpendicular to the diamond crystal from a wire loop carrying a current of $5\ \mathrm{mA}$ was obtained, with sensitivity and resolution power of 1 μT/√Hz And 1.4 μm, respectively.
  9. Keywords:
  10. Quantum Sensing ; Nitrogen Vacancy Center in Diamond ; Optically Detected Magnetic Resonance ; Widefield Magnetic Imaging

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