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Negative Refractive Index in a Four-Level Atomic System |
| ZHANG Hong-Jun1,2,3;GONG Shang-Qing1;NIU Yue-Ping1;LI Ru Xin1;XU Zhi-Zhan1 |
| 1State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Shanghai 201800
2Graduate School of Chinese Academy of Sciences, Beijing 100049
3School of Physics and Information Technology, Shaanxi Normal University, Xi’an 710062 |
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| Cite this article: |
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ZHANG Hong-Jun, GONG Shang-Qing, NIU Yue-Ping et al 2006 Chin. Phys. Lett. 23 1769-1772 |
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Abstract We propose a scheme for realizing negative refractive index in a four-level atomic system. It is shown that such a system can simultaneously exhibit negative permittivity and negative permeability in an optical frequency range. Furthermore, by analysing the dispersion property of the left-handed material, we find that the probe beam can be controlled from superluminal to subluminal or vice versa via choosing appropriate parameters.
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| Keywords:
42.50.Gy
42.25.Bs
78.20.Ci
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Published: 01 July 2006
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| PACS: |
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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