摘要
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.
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.
作者
张凯伦
侯志灵
孔令宝
房慧敏
战可涛
Kai-Lun Zhang Zhi-Ling Hou Ling-Bao Kong Hui-Min Fang Ke-Tao Zhan(School of Science ＆ Beijing Laboratory of Enyironmentally Harmful Chemicals Assessment, Beijing University of Chemical Technology, Beijing 100029 Key of Science, Beijing Technology and Business University, Beijing 100048)
基金
Supported by the National Natural Science Foundation of China under Grant No 51102007
the Fund for Discipline Construction of Beijing University of Chemical Technology under Grant No XK1702
