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Optics & Optoelectronic Technology

Electromagnetically Induced Left Handedness in Ladder-Type Four Level Atomic System

Qiang Chen

Published Jan 1, 2013• 0 citations
OpenAlex

Abstract

The system of a ladder-type four-level atoms interacting with multi-mode light fields is discussed to possess left handedness through the mechanism of quantum interference.In the representation of interaction,the density matrix method is utilized.The conclusion of the numerical simulation shows that to use appropriately chosen parameters,the real parts of both the relative dielectric permittivity and the relative magnetic permeability will be negative,and then the left handedness effect happens and the left-handed material is realized.The medium to affect light absorption and gain in the conclusion of the establishment of left-handed effect are also discussed.The results show that in the condition of weak probe field,the electro-magnetic induction can be used to achieve the left-handed effect of the medium.

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The system of a ladder-type four-level atoms interacting with multi-mode light fields is discussed to possess left handedness through the mechanism of quantum interference.In the representation of interaction,the density matrix method is utilized.The conclusion of the numerical simulation shows that to use appropriately chosen parameters,the real parts of both the relative dielectric permittivity and the relative magnetic permeability will be negative,and then the left handedness effect happens and the left-handed material is realized.The medium to affect light absorption and gain in the conclusion of the establishment of left-handed effect are also discussed.The results show that in the condition of weak probe field,the electro-magnetic induction can be used to achieve the left-handed effect of the medium.
The quantum system with an interaction between a closed Y-type four-level atom and multi-mode light fields is adopted to possess left handedness by means of the technique of quantum coherence. In the representation of interaction, the density matrix method is utilized in view of the rotating-wave approximation and the di-pole approximation.The conclusion of the numerical simulation shows that under the appropriate parameter conditions, the medium can achieve negative permittivity and negative permeability simultaneously (i.e. the left handedness effect happens and the left-handed material is realized.) In the condition of the weak probe field, when the Rabi frequency of probe light increases, the frequency range of the medium to achieve its left-handed effect decreases and the refractive index and absorption coefficient will also changed correspondingly. The medium to affect light absorption and gain in the conditions of the establishment of left -handed effect are also discussed. The paper can be concluded that, in the conditions of weak probe field, the electro-magnetic induction can be used to achieve the left-handed effect of the medium, which extends the implementation of left-handed materials in the experiment, and extends the application field of electro-magnetic induction.
The system of inverted Y-type four-level atoms interacting with multi-mode light fields is discussed. Through the mechanism of quantum interference, the relative dielectric permittivity and the relative magnetic permeability will changed remarkably. Using appropriately chosen parameters, the real parts of both the relative dielectric permittivity and the relative magnetic permeability will be negative, and then the left handedness effect happens and the left-handed material is realized. The properties of left-handed materials such as the range of frequencies of the negative refractive index can be manipulated via changing certain parameters of the system.
Using matrix equation theory,the properties of the relative dielectric permittivity and the relative magnetic permeability are investigated in a lamda-type four-level atomic system.By the means of numerical method,the real parts of both relative dielectric permittivity and the relative magnetic permeability will be negative simultaneously under the condition of choosing appropriately parameters,so the left handedness effect is obtained.In a certain scope,by adjusting the intensity of Rabi frequencies of the coherent field in the steady state,the ranges of left handedness effect are changed correspondingly.Additionally,the properties of the negative refractive index are studied in detail.
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.
We propose a scheme of electromagnetically induced left-handedness in a dense atomic vapor medium. By applying an incoherent pump field to manipulate the populations in atomic levels, and a strong coherent field to create quantum coherence, the magnetic part of the probe field can be amplified instead of strong absorption as usual materials. The system has negative permittivity and permeability simultaneously with transparent propagation of the electric part of the probe field. It is shown that the pumping rate of incoherent field, the intensity and frequency detuning of the coherent field, exert effects on the properties of the negative refractive index of left-handed material.