title: How to realize a negative refractive index material at the atomic level in an optical frequency range?
abstract: The theoretical mechanism for realizing a negative refractive index material in an optical frequency range with an atomic gas system of electromagnetically induced transparency (EIT) is studied. It is shown that under certain conditions such a dense gas can exhibit simultaneously negative permittivity and negative permeability, and negligibly small loss.
authors.affiliation: Centre for Optical and Electromagnetic Research, Joint Research Centre of Photonics of the Royal Institute of Technology (Sweden) and Zhejiang University, Zhejiang University, Hangzhou 310027, China. jqshen@coer.zju.edu.cn.
authors.forename: Jian-qi
authors.initials: JQ
authors.lastname: Shen
authors.forename: Zhi-chao
authors.initials: ZC
authors.lastname: Ruan
authors.forename: Sai-ling
authors.initials: SL
authors.lastname: He
mesh_terms: D017097:Electric Impedance; D004574:Electromagnetic Fields; D008962:Models, Theoretical; D055095:Optics and Photonics; D011789:Quantum Theory; D012031:Refractometry / Q000379:methods*