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The European Physical Journal D

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

Kariman I. Osman, Saad S. M. Hassan, Amitabh Joshi

Published Jun 11, 2009• 29 citations
Publisher
DOI
10.1140/epjd/e2009-00173-x

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Coherent phenomena based on lasing without inversion (LWI), electromagnetically induced transparency (EIT) and enhanced index of refraction are due to the interaction of light with matter. Quite recently, the coherent phenomenon of spontaneously generated coherence (SGC) has emerged as a significant one in the study of several semiconductor nanostructures. In this article, we examine the linear optical properties in the EIT regime for a three-level V-type semiconductor quantum wells (QWs) in the presence of an incoherent pump field under the SGC effect. It is shown that for a suitable choice of a SGC parameter and an incoherent pump field, the linear absorption substantially changes into a probe field gain and at the same time modifies the dispersive properties of the medium.
Using Schrodinger–Maxwell formalism, we propose and analyse a continuous-wave four-wave mixing (FWM) scheme for the generation of coherent light in a five-state double-Λ atomic system with or without spontaneously generated coherence (SGC) based on electromagnetically induced transparency (EIT). We derive the corresponding explicit analytical expressions for the generated FWM field under the steady-state condition. The influence of hyperfine sublevel and SGC effect on the amplitude of the generated FWM field is predicted in detail via the derived analytical expressions. We also give a brief discussion on the experimental realization of the proposed scheme.