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Sub-second temporal magnetic field microscopy using quantum defects in diamond.

Madhur Parashar1,2, Anuj Bathla3,4, Dasika Shishir3

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This study enhances magnetic field microscopy speed using lock-in detection with Nitrogen Vacancy (NV) centers in diamond. The new method achieves high frame rates for imaging dynamic microscale magnetic fields.

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Area of Science:

  • Quantum sensing
  • Optics and Magnetometry

Background:

  • Wide-field magnetic field microscopy uses Nitrogen Vacancy (NV) centers in diamond.
  • Current techniques have slow acquisition times (minutes per image), limiting dynamic process imaging.

Purpose of the Study:

  • To significantly enhance the magnetic field imaging frame rate.
  • To enable real-time imaging of dynamic microscale magnetic fields.

Main Methods:

  • Implemented lock-in detection of NV photoluminescence (PL) using a multi-pixel lock-in camera.
  • Synchronized frequency-modulated NV PL with fast camera frame demodulation at kilohertz frequencies.

Main Results:

  • Achieved magnetic field imaging frame rates of 50-200 frames per second.
  • Successfully imaged sub-second varying microscale currents in planar microcoils.

Conclusions:

  • Wide-field per-pixel lock-in detection of frequency-modulated NV ODMR enables dynamic magnetic field microscopy.
  • This advancement opens possibilities for studying fast, dynamic magnetic phenomena at the microscale.