Origin of Negative Imaginary Part of Effective Permittivity of Passive Materials
Kai-Lun Zhang1 , Zhi-Ling Hou1** , Ling-Bao Kong2 , Hui-Min Fang1 , Ke-Tao Zhan1
1 School of Science & Beijing Key Laboratory of Environmentally Harmful Chemicals Assessment, Beijing University of Chemical Technology, Beijing 1000292 School of Science, Beijing Technology and Business University, Beijing 100048
Abstract ：The anti-resonant phenomenon of effective electromagnetic parameters of metamaterials has aroused controversy due to negative imaginary permittivity or permeability. It is experimentally found that the negative imaginary permittivity can occur for the natural passive materials near the Fabry–Perot resonances. We reveal the nature of negative imaginary permittivity, which is correlated with the magnetoelectric coupling. The anti-resonance of permittivity is a non-inherent feature for passive materials, while it can be inherent for devices or metamaterials. Our finding validates that the negative imaginary part of effective permittivity does not contradict the second law of thermodynamics for metamaterials owing to the magnetoelectric coupling.
收稿日期: 2017-04-10
出版日期: 2017-08-15
:
77.22.Ch
(Permittivity (dielectric function))
77.22.-d
(Dielectric properties of solids and liquids)
78.67.Pt
(Multilayers; superlattices; photonic structures; metamaterials)
71.45.Gm
(Exchange, correlation, dielectric and magnetic response functions, plasmons)
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2017, Vol. 34 
