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Switching from EIT to EIA in a four-level N-type atomic system

  • Kavita Yadav
  • Ajay Wasan
Research Article
  • 16 Downloads

Abstract

We study the optical properties of a four-level N-type system theoretically for \(^{87}\)Rb atoms using density matrix formalism. Electromagnetically induced transparency and electromagnetically induced absorption (EIA) are two extensively studied two-photon coherence phenomena. EIA can be observed as a result of the transfer of coherence and transfer of population between the atomic levels. A narrow absorption is observed at the resonance frequency for moving atoms. Enhanced transmission and absorption lead to sub-luminal and super-luminal light propagation, respectively. It is observed that the third field in N-type system causes switching from transmission to absorption. We also discuss group index changes with coupling field strength.

Keywords

N-type system Electromagnetically induced transparency Electromagnetically induced absorption Optical switching 

Notes

Acknowledgements

KY acknowledges financial support from the MHRD, India. This work is supported by the SERB, India (Grant No. SB/S2/LOP/009/2014).

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Copyright information

© The Optical Society of India 2018

Authors and Affiliations

  1. 1.Department of PhysicsIndian Institute of Technology, RoorkeeRoorkeeIndia

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