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Chin. Phys. B, 2016, Vol. 25(2): 027801    DOI: 10.1088/1674-1056/25/2/027801

Superluminal light attenuated by strong dispersion of complex refractive index

Abdurahman Ahmed Yonis, Vadim Nickolaevich Mal'nev, Belayneh Mesfin Ali
Department of Physics, Addis Ababa University, P O Box 1176, Addis Ababa, Ethiopia
Abstract  The propagation of narrow packets of electromagnetic waves (EMWs) in frequency dispersive medium with the consideration of the complex refractive index is studied. It is shown that counting in the dispersion of the complex refractive index within the context of the conventional expression of the group velocity of narrow wave packets of EMWs propagating in a dispersive medium results in the appearance of additional constraints on the group velocity, which dictates that the physically acceptable group velocity can only be realized in the case of a negligible imaginary part of the group index. In this paper, the conditions that allow one to realize the physically acceptable group velocity are formulated and analyzed numerically for the relevant model of the refractive index of a system of two-level atoms in the optical frequency range. It is shown that in the frequency band where superluminal light propagation is expected, there is a strong dispersion of the refractive index that is accompanied with strong absorption, resulting in a strongly attenuated superluminal light.
Keywords:  group velocity      group index      superluminal light      slow waves  
Received:  18 July 2015      Revised:  14 October 2015      Accepted manuscript online: 
PACS:  78.20.Ci (Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))  
  73.20.Mf (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))  
Corresponding Authors:  Belayneh Mesfin Ali     E-mail:

Cite this article: 

Abdurahman Ahmed Yonis, Vadim Nickolaevich Mal'nev, Belayneh Mesfin Ali Superluminal light attenuated by strong dispersion of complex refractive index 2016 Chin. Phys. B 25 027801

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