Journal of Optics

, Volume 48, Issue 1, pp 65–69 | Cite as

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

  • Kavita Yadav
  • Ajay WasanEmail author
Research Article


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.


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



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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