Abstract
According to direction relationship among the triplet of vectors of electric field intensity, magnetic field intensity and wave vector of electromagnetic wave, materials have usually been classified as right- and left-handed material. Here, we shall strictly and systematically demonstrate that, in a linear isotropic homogeneous medium, the direction relationship among the triplet of vectors of electric field intensity, magnetic field intensity and wave vector of electromagnetic wave may generally alter between right-handedness and left-handedness with change of time except for the special cases. Thus the further classification of materials according to handedness and corresponding criterion are proposed.
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