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Controlling negative refractive index of degenerated three-level \(\Lambda \)-type system by external light and magnetic fields

  • Regular Article – Optical Phenomena and Photonics
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Abstract

We have achieved the negative refractive index for the probe light in a degenerated three-level \(\Lambda \)-type atomic medium under electromagnetically induced transparency. The width of the frequency band of the negative refractive index can be changed by adjusting the coupling light intensity, while the position of the frequency band of the negative refractive index can be shifted to low or high frequency region by varying the coupling light frequency or the external magnetic field. Furthermore, the positive refractive index for a given probe frequency can be converted to the negative refractive index and vice versa by adjusting the strength or the sign of the magnetic field. This means that we can use the external magnetic field as a “knob” to control the sign of the refractive index of the material which can obtain the desired material with positive or negative index.

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Data Availability Statement

This manuscript has no associated data or the data will not be deposited. [Authors’ comment: No datasets were generated or analyzed during the current study. The results are based on theoretical analysis.]

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Funding

Vietnamese National Foundation of Science and Technology Development (103.03-2019.383).

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Authors and Affiliations

  1. Vinh University, 182 Le Duan Street, Vinh City, Vietnam

    Nguyen Huy Bang & Le Van Doai

Authors
  1. Nguyen Huy Bang
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  2. Le Van Doai
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Contributions

NHB and LVD conceived of the presented idea, developed the theory and performed the analytic calculations. All authors co-wrote the paper, discussed the results and contributed equally to the final manuscript.

Corresponding author

Correspondence to Le Van Doai.

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The authors declare no conflict of interest.

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Bang, N.H., Van Doai, L. Controlling negative refractive index of degenerated three-level \(\Lambda \)-type system by external light and magnetic fields. Eur. Phys. J. D 75, 261 (2021). https://doi.org/10.1140/epjd/s10053-021-00275-5

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  • DOI: https://doi.org/10.1140/epjd/s10053-021-00275-5

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