Simultaneous negative permittivity and permeability in a coherent atomic vapour |
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Authors: | Shen Jian-Qi |
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Affiliation: | Centre for Optical and Electromagnetic Research, Zhejiang University, Hangzhou 310058, China Joint Research Centre of Photonics of the Royal Institute of Technology, (Sweden)and Zhejiang University, Hangzhou 310058, China |
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Abstract: | A new quantum optical mechanism to realize simultaneously negative
electric permittivity and magnetic permeability is suggested. In
order to obtain a negative permeability, we choose a proper atomic
configuration that can dramatically enhance the contribution of the
magnetic-dipole allowed transition via the atomic phase coherence. It
is shown that the atomic system chosen with proper optical parameters
can give rise to striking electromagnetic responses (leading to a
negative refractive index) and that the atomic vapour becomes a
left-handed medium in an optical frequency band. Differing from the
previous schemes of artificial composite metamaterials (based on
classical electromagnetic theory) to achieve the left-handed
materials, which consist of anisotropic millimetre-scale composite
structure units, the left-handed atomic vapour presented here is
isotropic and homogeneous at the atomic-scale level. Such an
advantage may be valuable in realizing the superlens (and hence
perfect image) with left-handed atomic vapour. |
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Keywords: | negative permittivity negative
permeability coherent atomic vapour electric- and magnetic-dipole
allowed transitions |
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