Detecting the Oscillating Magnetic Field with the Help of Vector Light-Atom InteractionONLINE ONLY

In recent years, much attention has been given to detecting and measuring static and oscillating magnetic fields. Measurement of the magnetic field can be useful in the study of the heart or brain, in magnetic resonance imaging (MRI), in detecting dark matter, and in many more areas. Optically pumped atomic magnetometers [1] are one of the prominent methods available to detect the magnetic field. The traditional atomic magnetometers are based on Faraday rotation of the light interacting with the atoms in the presence of the external magnetic field.

In 2021, F. Castellucci et al. [2] demonstrated a method to detect the alignment of the magnetic field by observing the transmitted intensity of the vector light beam passing through the atomic medium. However, the experimental work was limited to static magnetic fields. In this talk, I propose a new theoretical method that we have developed to detect the oscillating magnetic field using vector light-atom interaction. For that purpose, we investigate the photoexcitation of Rubidium atoms by vector Bessel beams in the presence of the oscillating magnetic field. We carry out our calculations using density matrix formalism and based on the Liouville-von Neumann equation. In particular, we analyze the population of the excited atomic state in the beam cross-section of the vector Bessel beam for various strengths and frequencies of the oscillating magnetic field. Our results can be useful in detecting the strength and frequency of the oscillating magnetic field. In addition, we believe that our results can enhance the quantum metrology experiments based on twisted light atom interaction.

References:

1. D. Budker et al. Nature Physics 3, 227–234 (2007).
2. F. Castellucci et al. Phys. Rev. Lett. 127, 233202 (2021)

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