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Physical Review B

Phase-dependent electromagnetically induced transparency and its dispersion properties in a four-level quantum well system

Amitabh Joshi

Published Mar 24, 2009• 108 citations
Publisher

Abstract

The four-level inverted-Y configuration realizable in an asymmetric quantum well system interacting with four fields is studied to demonstrate the phenomenon of phase-dependent electromagnetically induced transparency (EIT) in this system. The system is studied under various parametric conditions to demonstrate the controllability of EIT, dispersion properties, and group velocity.

DOI
10.1103/physrevb.79.115315

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The four-level inverted-Y configuration realizable in an asymmetric quantum well system interacting with four fields is studied to demonstrate the phenomenon of phase-dependent electromagnetically induced transparency (EIT) in this system. The system is studied under various parametric conditions to demonstrate the controllability of EIT, dispersion properties, and group velocity.
The absorption and dispersion properties of an N-type four-level system with Doppler(broadening) effect were investigated.In this system we considered two coherent fields and a probe field.When the second coherent field is absent,this system is a single three-level configuration,and the absorption line is just one clear electromagnetically induced transparency(EIT) window.While the second coherent field exists,there are two EIT windows which become wide and deep with the(coherent) intensity increasing.The position width and absorbance of the transparency windows can be manipulated by adjusting the detuning of the driving field.In addition,we also found that the medium shows a large refractive index at each transparency window,and the group velocity of the probe laser can be reduced.
The optical properties of a five-level atomic system composed of a 'Lambda'-type four-level atomic and a tripod four-level atomic systems are investigated. It is found that the behaviors of electromagnetically induced transparency (EIT) and group velocity can be controlled by choosing appropriate parameters with the interacting dark resonances. In particular, when all the fields are on resonance, the slow light at the symmetric transparency windows with a much broader EIT width is obtained by tuning the intensity of the coupling field in comparison with its sub-system, which provides potential applications in quantum storage and retrieval of light.
In this paper we examine the absorption and dispersion properties of a weak probe field via Electromagnetically Induced Transparency (EIT) in a four-level system. It is shown that under certain condition, using this model, the absorption cancellation is appeared and the medium becomes transparent to the weak probe field. It will be shown that the controlling of absorption and dispersion spectrum depends on some atomic parameters. The effects of quantum interference on the absorption and dispersion spectrum are also investigated
The electromagnetically induced transparency (EIT) phenomenon in a four level atomic system with tripod configuration is studied. The results show that this configuration is equivalent to the combination of two single three-level ΛΛΛ configurations, which, under certain conditions, results in the so-called double-EIT (DEIT) phenomenon. The properties of the double transparency windows for DEIT are discussed in detail and the possible experimental scheme is proposed.