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Negative refraction is the electromagnetic … Negative refraction is the electromagnetic phenomenon where light rays become refracted at an interface that is opposite to their more commonly observed positive refractive properties. Negative refraction can be obtained by using a metamaterial which has been designed to achieve a negative value for (electric) permittivity (ε) and (magnetic) permeability (μ); in such cases the material can be assigned a negative refractive index. Such materials are sometimes called "double negative" materials. Negative refraction occurs at interfaces between materials at which one has an ordinary positive phase velocity (i.e., a positive refractive index), and the other has the more exotic negative phase velocity (a negative refractive index).se velocity (a negative refractive index).
, La réfraction négative est un phénomène de … La réfraction négative est un phénomène de réfraction qui ne suit pas les lois de Descartes applicables dans le modèle de l'optique géométrique. Dans ce cas, l'onde réfractée se propage du même côté de la normale à la surface que l'onde incidente. Dans le modèle de l'optique géométrique, ceci serait possible si l'indice optique de réfraction n était négatif, ou encore que la vitesse de phase était négative. Pour l'instant, la réfraction négative n'a été observée expérimentalement que dans le domaine des micro-ondes.ement que dans le domaine des micro-ondes.
, 负折射（英語：Negative refraction）指的是光束在界面处的折射方向与正常折射方向（正常的折射光线与入射光线在法线异侧）相反，即折射光线和入射光线位于法线同侧的电动力学现象。用同时具备负介电常数 和负磁导率的超材料可以得到这一现象。此时超材料具负折射率。 这样的材料也被称作负折射率材料。 负折射会在具备正相速度（正折射率）的介质与负相速度（负折射率）介质的界面处发生。
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La réfraction négative est un phénomène de … La réfraction négative est un phénomène de réfraction qui ne suit pas les lois de Descartes applicables dans le modèle de l'optique géométrique. Dans ce cas, l'onde réfractée se propage du même côté de la normale à la surface que l'onde incidente. Dans le modèle de l'optique géométrique, ceci serait possible si l'indice optique de réfraction n était négatif, ou encore que la vitesse de phase était négative. Pour l'instant, la réfraction négative n'a été observée expérimentalement que dans le domaine des micro-ondes.ement que dans le domaine des micro-ondes.
, Negative refraction is the electromagnetic … Negative refraction is the electromagnetic phenomenon where light rays become refracted at an interface that is opposite to their more commonly observed positive refractive properties. Negative refraction can be obtained by using a metamaterial which has been designed to achieve a negative value for (electric) permittivity (ε) and (magnetic) permeability (μ); in such cases the material can be assigned a negative refractive index. Such materials are sometimes called "double negative" materials.etimes called "double negative" materials.
, 负折射（英語：Negative refraction）指的是光束在界面处的折射方向与正常折射方向（正常的折射光线与入射光线在法线异侧）相反，即折射光线和入射光线位于法线同侧的电动力学现象。用同时具备负介电常数 和负磁导率的超材料可以得到这一现象。此时超材料具负折射率。 这样的材料也被称作负折射率材料。 负折射会在具备正相速度（正折射率）的介质与负相速度（负折射率）介质的界面处发生。
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Réfraction négative
, Negative refraction
, 负折射
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