Chinese Optics Letters, Volume. 5, Issue s1, 222(2007)
Electromagnetically induced negative refractive index in dense atomic gas
We propose two dense gas schemes of four-level 'Lambda'-type and V-type atoms based on the effect of quantum coherence. It is shown that under certain conditions the dense gas can simultaneously exhibit negative permittivity and negative permeability, and thus become a negative refractive-index material. Furthermore, by analyzing the absorption property of the left-handed materials, we find that the absoption can be reduced via choosing appropriate parameters. Such schemes might be used to fabricate isotropic and homogeneous left-handed material with vanishing absorption in a wider optical frequency band.
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Hongjun Zhang, Yueping Niu, Shiqi Jin, Ruxin Li, Shangqing Gong. Electromagnetically induced negative refractive index in dense atomic gas[J]. Chinese Optics Letters, 2007, 5(s1): 222