Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Journal of Optics

Controllable refractive index in a four-level left-handed medium using pulse shaping

Nadia Boutabba

Published Jun 8, 2021• 4 citations
Publisher

Abstract

Abstract In this paper we control the negative refractive index of a four-level left-handed medium by applying different waveforms to excite the atomic system. The control field is a few-cycle strong pulse described by a double exponential function, and its modified forms, a Gaussian field, and a tan-hyperbolic pulse. The considered four-level system was fully analyzed in terms of the density matrix formalism under the rotating wave approximation, and the refractive index for various control fields was obtained. Hence, under specific conditions, the tunneling, and the modulation of the negative refractive index are achieved for various shaped waveforms. Such strong-shaped laser pulses open the way to fully control the system.

DOI
10.1088/2040-8986/ac094e

Related papers

Negative refractive index in a four-level atomic system

Zhen-Qing Zhang, Zhengdong Liu, Shun‐Cai Zhao +3 more

A closed four-level system in atomic vapour is proposed, which is made to possess left handedness by using the technique of quantum coherence. The density matrix method is utilized in view of the rotating-wave approximation and the effect of a local field in dense gas. The numerical simulation result shows that the negative permittivity and the negative permeability of the medium can be achieved simultaneously (i.e. the left handedness) in a wider frequency band under appropriate parameter conditions. Furthermore, when analysing the dispersion property of the left-handed material, we can find that the probe beam propagation can be controlled from superluminal to subluminal, or vice versa via changing the detuning of the probe field.

Chinese Physics B•Dec 1, 2011•6 citations

Zero absorption and a large negative refractive index in a left-handed four-level atomic medium

Shun‐Cai Zhao, Zhengdong Liu, Qixuan Wu

In this paper, we have investigated three external fields interacting with the four-level atomic system described by the density-matrix approach. The atomic system exhibits left-handedness with zero absorption and large negative refractive index. Varying the parameters of the three external fields, the properties of zero absorption and large negative refractive index from the atomic system remain unvarying. Our scheme proposes an approach to obtain a negative refractive medium with zero absorption. The zero absorption property of the atomic system may be used to amplify the evanescent waves that have been lost in the imaging by traditional lenses, and a slab fabricated by the left-handed atomic system may be an ideal candidate for designing perfect lenses.

arXiv:2403.00042•Journal of Physics B Atomic Molecular and Optical Physics•Jan 28, 2010•21 citations

Light drag in an optically dense left-handed atomic medium

Hazrat Ali, Nadia Boutabba

Abstract In this paper, we investigate the light drag in an optically dense negative refractive index medium. Our model is a four-level atomic system in which we demonstrate an enhancement of the light drag while keeping the negative refraction condition. Furthermore, we control the shift in the light drag by tuning both the strong coupling field and the detuning. Hence, we observe that the light drag in the negative refractive index material can be controlled to switch from subluminal to superluminal at various ranges of the detuning. Our system suggests a straightforward technique for realizing and controlling light dragging in materials with negative refractive indices, or ‘NRI,’ which might open the way for more efficient use of left-handedness in atomic systems.

Physica Scripta•Mar 15, 2023•3 citations

Electromagnetically induced negative refractive index in a V-type four-level atomic system

张红军, 钮月萍, 龚尚庆

We propose a scheme for realizing negative refractive index in a V-type four-level atomic system. It is shown that the negative refractive index can be achieved in a wide frequency band based on the effect of quantum coherence. It is also found that the frequency band of negative refractive index and the absorption property of left-handed material are manipulated by the pump and control fields. Furthermore, left-handed material with reduced absorption is possible by choosing appropriate parameters. (c) 2006 Elsevier B.V. All rights reserved.

•Jan 1, 2007•0 citations

Negative Refractive Index in a Closed Four-level Atomic System

Su Xue-Mei

A closed four-level system in atomic vapor was proposed,which was made to possess left handedness by means of the technique of quantum coherence.The density matrix method was utilized in view of the rotating-wave approximation and the local-field effect in high dense gas.The conclusion of the numerical simulation shows that the medium can simultaneously exhibits left handedness in two visible frequency bands,and one can manipulate the width of the frequence bands by changing the intensity of the control field.

Journal of Jilin University(Science Edition)•Jan 1, 2009•0 citations

The analysis of the atomic population inversion under a few cycle strong shaped laser with a double exponential wave form

Nadia Boutabba, Sofiane Grira, Hichem Eleuch

In this paper we control the atomic population inversion of a three-level atomic medium by applying a few-cycle strong laser pulse to excite the system. We use a trong field which has the shape of a double exponential function.

Frontiers in Optics•Jan 1, 2021•0 citations
Abstract In this paper we control the negative refractive index of a four-level left-handed medium by applying different waveforms to excite the atomic system. The control field is a few-cycle strong pulse described by a double exponential function, and its modified forms, a Gaussian field, and a tan-hyperbolic pulse. The considered four-level system was fully analyzed in terms of the density matrix formalism under the rotating wave approximation, and the refractive index for various control fields was obtained. Hence, under specific conditions, the tunneling, and the modulation of the negative refractive index are achieved for various shaped waveforms. Such strong-shaped laser pulses open the way to fully control the system.
A closed four-level system in atomic vapour is proposed, which is made to possess left handedness by using the technique of quantum coherence. The density matrix method is utilized in view of the rotating-wave approximation and the effect of a local field in dense gas. The numerical simulation result shows that the negative permittivity and the negative permeability of the medium can be achieved simultaneously (i.e. the left handedness) in a wider frequency band under appropriate parameter conditions. Furthermore, when analysing the dispersion property of the left-handed material, we can find that the probe beam propagation can be controlled from superluminal to subluminal, or vice versa via changing the detuning of the probe field.
In this paper, we have investigated three external fields interacting with the four-level atomic system described by the density-matrix approach. The atomic system exhibits left-handedness with zero absorption and large negative refractive index. Varying the parameters of the three external fields, the properties of zero absorption and large negative refractive index from the atomic system remain unvarying. Our scheme proposes an approach to obtain a negative refractive medium with zero absorption. The zero absorption property of the atomic system may be used to amplify the evanescent waves that have been lost in the imaging by traditional lenses, and a slab fabricated by the left-handed atomic system may be an ideal candidate for designing perfect lenses.
Abstract In this paper, we investigate the light drag in an optically dense negative refractive index medium. Our model is a four-level atomic system in which we demonstrate an enhancement of the light drag while keeping the negative refraction condition. Furthermore, we control the shift in the light drag by tuning both the strong coupling field and the detuning. Hence, we observe that the light drag in the negative refractive index material can be controlled to switch from subluminal to superluminal at various ranges of the detuning. Our system suggests a straightforward technique for realizing and controlling light dragging in materials with negative refractive indices, or ‘NRI,’ which might open the way for more efficient use of left-handedness in atomic systems.
We propose a scheme for realizing negative refractive index in a V-type four-level atomic system. It is shown that the negative refractive index can be achieved in a wide frequency band based on the effect of quantum coherence. It is also found that the frequency band of negative refractive index and the absorption property of left-handed material are manipulated by the pump and control fields. Furthermore, left-handed material with reduced absorption is possible by choosing appropriate parameters. (c) 2006 Elsevier B.V. All rights reserved.
A closed four-level system in atomic vapor was proposed,which was made to possess left handedness by means of the technique of quantum coherence.The density matrix method was utilized in view of the rotating-wave approximation and the local-field effect in high dense gas.The conclusion of the numerical simulation shows that the medium can simultaneously exhibits left handedness in two visible frequency bands,and one can manipulate the width of the frequence bands by changing the intensity of the control field.