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Negative refractive index in a four-level atomic system |
| Zhang Zhen-Qing(张振清)a)c)d), Liu Zheng-Dong(刘正东)a)b)c)†, Zhao Shun-Cai(赵顺才)b)c), Zheng Jun(郑军)c)d), Ji Yan-Fang(姬艳芳) e), and Liu Nian(刘念)a)c)d) |
| a Institute of Modern Physics, Nanchang University, Nanchang 330047, China; b School of Materials Science and Engineering, Nanchang University, Nanchang 330031, China; c Engineering Research Centre for Nanotechnology, Nanchang University, Nanchang 330047, China; d School of Science, Nanchang University, Nanchang 330031, China; e SSchool of Foreign Languages, Wenzhou University, Wenzhou 325035, China |
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Abstract 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.
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Received: 25 April 2011
Revised: 10 June 2011
Accepted manuscript online:
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PACS:
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42.50.Gy
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(Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)
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42.25.Bs
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(Wave propagation, transmission and absorption)
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78.20.Ci
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(Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 60768001 and 10464002). |
Cite this article:
Zhang Zhen-Qing(张振清), Liu Zheng-Dong(刘正东), Zhao Shun-Cai(赵顺才), Zheng Jun(郑军), Ji Yan-Fang(姬艳芳), and Liu Nian(刘念) Negative refractive index in a four-level atomic system 2011 Chin. Phys. B 20 124202
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