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Physics Letters A

Competition between off-resonant and on-resonant processes in electromagnetically induced transparency in presence of magnetic field

Ranjit Kumar Singh, Nayan Sharma, Indra Hang Subba, Souvik Chatterjee, Ajay Tripathi

Published Sep 8, 2021• 5 citations
Publisher
DOI
10.1016/j.physleta.2021.127673

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The elimination of the absorption of a weak electromagnetic wave in a three-level atomic system in the presence of a strong resonant electromagnetic wave is well known in optics. This effect is termed electromagnetically induced transparency. We have theoretically investigated this effect in a crystal of molecular magnets. The crystal is subject to two (weak and strong) resonant magnetic fields. We discuss the choice of polarization of the magnetic fields. The influence of the distribution of the longitudinal anisotropy constant and the Land\'e factor on the manifestation of electromagnetically induced transparency has been studied. The amplitude of the strong field required for observation of the effect has been estimated.
We demonstrate a new method for measuring magnetic gradients in the presence of large constant magnetic fields using electromagnetically induced transparency in rubidium vapor. As the Earth provides a near-constant magnetic field of 25-50 µT, most measurements of small magnetic fields involve subtracting or shielding the Earth's field. Our method can measure small gradients in the presence of large magnetic fields using Electromagnetically Induced Transparency in 87Rb. By comparing the resonances of two laser beams in a dual-rail arrangement propagating through rubidium vapor in a spatially changing magnetic field, we are able to measure a constant gradient of ≥7 nT/cm and a time-varying gradient of ≥50 pT/cm, over a constant magnetic field of 35 µT.
We propose and analyze an effective scheme to generate hyper-Raman scattering via inhibiting electromagnetically induced transparency (EIT) in a monolayer graphene under a magnetic field. By solving the Schrödinger-Maxwell formalism, we derive explicitly analytical expressions for linear susceptibility, nonlinear susceptibility, and generated Raman electric field under the steady-state condition. Based on dressed-state theory, our results show a competition between EIT and hyper-Raman scattering, and the hyper-Raman process is totally dominant when multiphoton destructive interference is completely suppressed.