Issue Eur. Phys. J. D Volume 54, Number 1, July 2009 Page(s) 119 - 130 Section Quantum Optics and Quantum Information DOI 10.1140/epjd/e2009-00173-x Published online 16 June 2009

Eur. Phys. J. D 54, 119-130 (2009)
DOI: 10.1140/epjd/e2009-00173-x

Effect of spontaneously generated coherence on EIT and its refractive properties in four- and five-levels systems

K.I. Osman¹, S.S. Hassan² and A. Joshi<sup>3

1</sup>  Department of Mathematics, Al-Azhar University, Faculty of Science (Women's Section), P.O. Box 11754, Nasr City, Cairo, Egypt
²  Department of Mathematics, College of Science, University of Bahrain, P.O. Box 32038, Kingdom of Bahrain
³  Department of Physics, Eastern Illinois University, IL 61920 Charleston, USA

ajoshi@eiu.edu

Received 11 September 2008 / Received in final form 19 January 2009 / Published online 16 June 2009

Abstract
The effects of spontaneously generated coherence (SGC) and phases of optical fields on the phenomenon of electromagnetically induced transparency (EIT) are investigated in a four-level inverted-Y system and in a five-level K-type system under various parametric conditions in order to demonstrate controllability of the EIT, dispersion properties, and group velocity in such systems. Non-zero second-order susceptibility in both systems is due to the SGC effect. The experimental viability of the model in semiconductor quantum well systems is also discussed.

PACS
42.50.Gy - Effects of atomic coherence on propagation, absorption, and amplification of light; electromagnetically induced transparency and absorption.
42.50.Nn - Quantum optical phenomena in absorbing, amplifying, dispersive and conducting media; cooperative phenomena in quantum optical systems.

© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2009

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